Isx blowing coolant out overflow but not overheating

Radiator bubbling is usually because of overheating caused by low coolant. If the coolant level is low, as you drive the car, the motor heats up, increasing pressure in the system. When it gets hot enough, the coolant will boil. So, it expands and increases the pressure in the system, causing some to overflow through the radiator cap.

Some flash mobs are so wild you can hardly believe they happened. Check out 5 mind-blowing flash mobs at HowStuffWorks. Advertisement By now, so many groups have pulled off success...The most common reason for a coolant temperature gauge not working is a problem with the coolant temperature sensor. Signs of a bad sensor include black smoke in the exhaust, a car...It's not likely getting into the oil and definitely shouldn't be getting into the coolant. Make sure the air filters are good and the air filter piping is intact. Going back to your original issue though, if the EGR cooler or head gasket is leakingbit will get soot into the coolant. If the blowby is being caused by worn cylinder components it ...That may cause overheating of engine and boil off (coolant becomes vaporized like water becomes steam) which increases the coolant pressure significantly. Reactions: CMonclova1. ... The cap is new but constantly letting out air from the overflow and let's out coolant when RPM is added. A small amount of air bubbling in from lower hose and ...Jan 21, 2015 · 963 posts · Joined 2011. #3 · Jan 22, 2015. Check the small diameter hose that goes from the over flow bottle to the top of the radiator on the passenger side. Check all the other hoses too. I had a similar problem about the coolant a couple of years ago and it was that small hose leaking a little. Coolant filling up the overflow jug and not sucking back within 12 hrs means your head gasket is toast. Anytime you replace a failed head gasket you will need to send the head out for machining unless you want to do it all over again in short period of time. CD. 2008.5 2500 QCSB 6.7L 4x4 SLT Bighorn 68RFE 285/70R17 3.73.My coolant will shoot out overflow hose when under full throttle climbing hills and it shoots out alot of coolant. i did water bottle test and there are bubbles not alot but it was done at idle. I took air compressor air hose off and still getting bubbles compressor has just been changed recently.Step #1: Check Coolant Reservoir Levels. Ideally, you inspect your car’s coolant levels regularly, at least once a month. Regardless, the moment you notice any signs of coolant loss and no leaks are visible, you should check the reservoir before driving any further. If the coolant reservoir is empty and no leaks show, you should not start the ...

75 posts · Joined 2003. #9 · Nov 11, 2005. ok try this, turn the heater on to full blast, wait 5 min. then there 2 lines going to the heater core an inlet and outlet near the firewall. Touch one, the inlet, it should be hot. The other should be hot too if the coolant is going through the heater core.ford_doctor. I was thinking the CAC was leaking however you already replaced it. You might want to start looking at the secondary cooling system itself - I would suspect the system is overheating and if you removed the EGR cooler the ECT2 sensor is now gone unless your delete relocated it.My 2006 Peterbilt 379, Cummins ISX engine, has used 4 gallons of coolant this week. It does not appear to be leaking anywahere, but when the truck is running, you can smell hot coolant around the passenger side. The low coolant light never comes on while running, but only after being shut off for 12 hours or more. I'm guessing EGR cooler?Coolant pushing from expansion tank to overflow tank. Things I've tried to fix it. New expansion/overflow tank, new caps, new egr, engine overhauled, no overheating …The coolant was being lost through the coolant overflow hose. I fought with this, stopping every 30-45 minutes and adding 1/4 to 1/2 gallon of water. The engine never did run hot, with the hottest it ever got being a hair over 200.Coolant filling up the overflow jug and not sucking back within 12 hrs means your head gasket is toast. Anytime you replace a failed head gasket you will need to send the head out for machining unless you want to do it all over again in short period of time. CD. 2008.5 2500 QCSB 6.7L 4x4 SLT Bighorn 68RFE 285/70R17 3.73.10. A Fluid Leak. All kinds of fluid leaks can cause a burning smell from the car without overheating. These can range in severity from something as simple as oil dripping off the dipstick and landing on the exhaust manifold, to something as severe as coolant spattering on the engine block from a cracked cylinder head.

5) External leaks. If a cylinder head gasket has blown between the water or oil passage and the outside of the engine, the result can be a simple coolant or oil leak. This is the least dire version of a blown head gasket, but is serious nonetheless. An external leak may not manifest itself as an immediate problem (other than causing a mess ...subiesailor. 22689 posts · Joined 2008. #9 · May 12, 2011. It may need to idle for 10 minutes or so and once you see that there are no more bubbles surfacing you can shut the car off. Top off the coolant in the radiator - put the cap back on. Then check the level in your over flow bottle and top up if needed.4094 posts · Joined 2006. #3 · Sep 23, 2017. If the hole is in the neck of the reservoir, it's probably there to vent any steam if the cap is loosened on a hot engine. Check that the cap is securely fastened and sealing OK. If everything appears OK, then the pressure seal may have failed and the cap may need replacing.Rawze.com: Rawze's ISX Technical Discussion and more / Big Truck Technical Discussion... / ISX Related Help / ISX-15 pushing coolant out of reservoir tank -help- Pages (3): « Previous 1 2 3 Next »Could be my air compressor? Could be head gasket? Never over heated my truck, and no DEF no egr no egr cooler... it could also be my spacer that been installed …

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Elizabethtown, ky: Didnt want to hijack the thread below. we have a 2004 pete with an ISX 460 in it. today i drove it to the other farm and filled with corn, headed out to the elevator and it got hot and shut down, when shut off it began blowing coolant out the overflow on the radiator tank cap.Dec 11, 2012. #1. Hello - i have a 2003 honda civic that i have to add antifreeze to every week. Antifreeze seems to be sprayed all over the between the engine and the radiator. It seems like the radiator overflow tank is filling up with the antifreeze not being drawn back into the radiator.i had this checked out at the local repair shop and ...1466 posts · Joined 2005. #2 · Jul 16, 2006. there is no other cap. it still can have a broken head bolt or something to that effect (without overheating). also make sure the coolant is a 50/50 mix if its not it could actually boil. when the engine is shut off it tends to get slightly hotter before it starts to cool.Blowing coolant out overflow. Thread starter loreak; Start date May 1, 2004; May 1, 2004 #1 loreak. Proven Member. 533 0 Mar 26, 2003 PennsylvaniaUS. Ok it seems if i drive nice its fine, but if i boost alot and basically race around, it doesnt take long until im almost out of coolant and i start overheating, as long as im moving its ok, but if ...I have a 2017 Ram 3500 6.7 that just started pushing coolant out of the coolant reservoir. First thought was a head gasket, but it's not running hot and hasn't been overheated, a stock boost. The light will be on for low coolant in the morning, fill it back up to the mark, drive 30 minutes, and the level is at the top of the cap and pushing out ...

Aug 2, 2020 · Coolant pushing from. 2018 kenworth t680 isx Cummins. Coolant pushing from expansion tank to overflow tank. Things I've tried to fix it. New expansion/overflow tank, new caps, new egr, engine overhauled, no overheating problems, started at 200k, overhaul at 560k. Still having the problem. You must be able to see thru all the fins from top to bottom, if the battery is sitting in front of the radiator remove it to clean,we wash them out with a water hose then take a air hose to blow out the fins, sometimes it takes 2-3 times to get one clean. Tommy. Affordable Tractor Sales. "Your Jinma Parts Superstore".1463 posts · Joined 2022. #12 · Mar 2, 2024. One of the most common causes of overheating is the overflow tank "radiator" cap. You may think it is tight because it reached a stop when tightening. This is only the first stop, technically it is the pressure relief stop when removing it. Push down and turn some more.I removed the head and checked the gasket. Gasket is good. The head bolts were loose to start with. Re-torqued the head and fixed that problem. Filled the radiator and ran it for a few minutes. Refilled the rad and ran it again for a few minutes. The bike runs great but is now blowing the coolant out of the overflow. The fan is not coming on.This is not 100% accurate. 1) There is a reason your overflow tank has a MAX and a MIN line in it - and your coolant level, while cold, should NEVER be below the MIN line. 2) The overflow tank/reservoir, is in fact, based off of a "vacuum/siphon" type system. When you drive your Jeep, and the coolant level gets to operating temp, you will see ...The truck is a 2008 Ford F250, 6.4 Powerstroke V8, 4x4, King Ranch, Crew Cab, Short Bed, with 72000mls on it. As called in the title - it blows coolant out of the cab of the coolant tank. When I drive and the coolant reaches 196°F the coolant line from the water pump to the radiator gets hard, the radiator stays cool and because of the ...Jun 2, 2018 · Temps outside going down 85 to 90, lost just over a gallon of fluid then. Temps coming home, around 70 and raining, short of a gallon used to top off. Both times, had display up, max temp showing in display, about 205, most of the time around 190. Chris . Sandpiper 379 FLOK, Volvo 2012 730. 10. A Fluid Leak. All kinds of fluid leaks can cause a burning smell from the car without overheating. These can range in severity from something as simple as oil dripping off the dipstick and landing on the exhaust manifold, to something as severe as coolant spattering on the engine block from a cracked cylinder head.I own a 2007 300C, running the Diablo Performance Tune 91CAI, and a Ingen Cold Air Intake. Recently, my engine has been overheating (all the way to the red line) and I can hear the coolant bubbling vigorously inside the tank. Before the overheating started happening, my car stopped blowing warm air all together (which is a huge problem in the ...Rawze.com: Rawze's ISX Technical Discussion and more / Big Truck Technical Discussion... / ISX Related Help / ISX-15 pushing coolant out of reservoir tank -help- Pages (3): « Previous 1 2 3 Next »

I have a 95 f250 with a 460. I had coolant come out of the overflow bottle after sitting for a couple minutes. Has only happened one time but dont want to chance harming the engine. New water pump and thermostat 700 miles ago. Truck doesnt overheat. Drained oil to check for coolant, no coolant in oil.

My 2006 Peterbilt 379, Cummins ISX engine, has used 4 gallons of coolant this week. It does not appear to be leaking anywahere, but when the truck is running, you can smell hot coolant around the passenger side. The low coolant light never comes on while running, but only after being shut off for 12 hours or more. I'm guessing EGR cooler?851 posts · Joined 2008. #2 · Feb 28, 2011. If you suspect air pocket, try bleeding the coolant by loosening the allen bolt. 07.5 6.7L 2500, Straight flange 2nd gen, ARP 625, Thuren/Carli goodies.CowboyRam Discussion starter. 1267 posts · Joined 2015. #1 · May 5, 2017. We have been trying to figure out why our MF 1135 is blowing off antifreeze. At first we thought that we had a bad hose, so we replaced the top hoses. Then we took out the radiator and had it checked; it is fine. It seems to blow off during a hard pull.You must be able to see thru all the fins from top to bottom, if the battery is sitting in front of the radiator remove it to clean,we wash them out with a water hose then take a air hose to blow out the fins, sometimes it takes 2-3 times to get one clean. Tommy. Affordable Tractor Sales. "Your Jinma Parts Superstore".Jun 3, 2013 · The coolant was being blown out of the over flow bottle. Upon removing the head. We noticed 5 of the 6 injectors had failed. The tips of the injectors had discentigreated. We have no clear indication it was the head gasket, we gave it a full visual inspection. And found nothing that jumped out at us. According to the driver the truck was ... The main causes of Coolant Reservoir overflowing but not overheating are faulty radiator caps, air pockets in the cooling system, and head gasket leaks. These issues can lead to improper pressure regulation, trapped air, and combustion gas entry, causing coolant overflow.This is done by sucking gases in either the radiator or overflow tank and mixing with a chemical. Be careful though, if your water pump has failed, coolant may back up in the radiator or overflow tank if no radiator cap is present. If the test shows no exhaust gases (hydrocarbons), then most likely if the thermostat (s) have been check, its the ...

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Jason have a navara D40 V9X 550 V6 which is blowing coolant out the overflow tank and overheating. No white exhaust, no water in the oil, no oil in the water. Still have full power but i have an EGR position fault. Would the EGR be passing exhaust gas into the cooling system?Try burping the radiator to remove possible trapped air in the system. Park on a slope, hood uphill. With the motor running, slowly open the radiator cap just enough to let the air out. Use a towel, don't burn yourself. After you do that a few times top it off with fresh fluid.Posts: 2,321. Let's take a look at why the coolant is coming out the overflow tube. The spring in the pressure cap has to be overcome by the pressure in the cooling system. Once that happens the rubber radiator cap gasket lifts off the filler neck seat and coolant flows out and down the overflow hose.2011 6.7 pouring coolant out exhaust. truck started overheating the other day. checked coolant and was low, added coolant but it never would top off and water pouring out exhaust with engin not running. did some research and came to conclusion that it was the egr cooler. did egr cooler delete and still have same problem.Mk7 Golf 2.0 TDI. Nov 16, 2017. #1. Hi all, decided to share my pain with VW community after ~8 months of troubleshooting by VW (Australia). 2013 Mk7 Golf 110TDI is pushing coolant out from the surge tank. Looks like gases enter the jacket under load, accumulate and then rush up to expansion bottled causing it to overflow - overflow pipe is ...Coolant Overflow Boil But No Overheating. I have a 1996 Suzuki Sidekick Sport and having a strange issue with the coolant. If I take it out on the highway for any length of time, once I get to my destination, the coolant overflow is bubbling and boiling, yet the temp gauge in the vehicle stays right in the middle.Posted March 30, 2018. You could run the engine at idle/low speeds pretty much right up to operating temps without a cap until the coolant expanded enough to pour out the top. Operating normally, a bit of 'bubbling' is seen in the coolant because of flow and air space at the top of the rad but.Coolant boiling, no overtemp on gauge. 2013 Cruze 1.4L turbo. Coolant is boiling out of reservoir when running. The gauge never shows any indication of getting too hot. Thermostat is new, new reservoir tank and cap. Not leaking any coolant anywhere, only when it boils over. Passenger side going into the radiator the hose feels cold, driver side ... ….

The main causes of Coolant Reservoir overflowing but not overheating are faulty radiator caps, air pockets in the cooling system, and head gasket leaks. These issues can lead to improper pressure regulation, trapped air, and combustion gas entry, causing coolant overflow.Three major things cause coolant to boil out of the tank, assuming you've bled your coolant system properly. A) Bad radiator cap and/or crud around mating surface ... Coolant coming out of overflow drain but not overheating. DSMToretto; Feb 16, 2014; Newbie Forum; 2. Replies 26 Views 81K. Mar 25, 2014. AWDThunder. Question; Overflowing out of ...The vehicle is in excellent condition and is bone stock, even has the factory radio and toolkit! The vehicle does not overheat and runs excellent, every 2-3 days I have to top off the radiator. The coolant is pushing out of the rad cap and filling the overflow bottle until it's literally overflowing.Oct 4, 2021 · Hey. 2009 Volvo VNL with ISX engine. Having issues with coolant lost and moisture in crankcase filter housing. 1 million miles on truck. ECM show EGR deleted but no pipes have been blocked off. Looking for suggestions on steps to diagnose coolant issue. Also I have some pictures I would like to submit regarding hoses on the intake side. I have changed radiator and reservoir cap hoping this could solve the issue but dont. Then I filled coolant into the radiator to full. (the overflow is between min/max and the reservior is 3/4). Today morning I have opened the radiator (system was cold) and the coolant push out, yet the bubbling decreased a bit.When I had the overheating b4 adding "conditioner" my temp gauge would climb to the low side of red and then blow the coolant out the top of the bottle. I would get the bottle at or near "low" when cool. Then do a test drive and see what happens. If it continues to blow coolant then you probably have an HG failure.Dec 9, 2007 · My Volvo has a new multichamber coolant overflow tank that transfers coolant onto the ground. On one side of the tank, the sensor tells me I'm low on coolant, so I fill it up to the line. Then, the truck runs warm for a few hours, and coolant flows back into the other side, eventually filling up that chamber until it drains out hose to the ground. My 2000 Accent with 164,000km is not overheating but is dumping coolant into the reservoir so that the radiator is about a quart low. I did have a few problems with it overheating in the past month, but that was solved by thermostat removal (always above 80F here). I stopped before the overheats reached the redline and allowed the engine to ...There are many reasons why coolant blows out of reservoir, which happens in several vehicle parts. Let's dive in! Automotive Cooling System. 1. An Unactivated Cooling Pan. When the means of transport stops, the fan takes responsibility for keeping the radiator (engine cooling). In this case, a series of wires hooks the radiator. Isx blowing coolant out overflow but not overheating, No signs of overheating that's all. Submitted: 1 year ago. Category: Medium and Heavy Trucks. Show More. ... i have an ISX 1 EGR DPF pushes coolant out the overflow, ... an isx15 cm2250 400hp with 680K miles on it in a 2012 peterbilt 386 that is over pressurizing the cooling system and blowing coolant from the pressure relief cap ..., What I did just notice though is that when the engine cools down all of the coolant in the bottle that came from the engine when it was hot is not siphoning back into the engine, leaving the bottle about 3/4 full and the block down a little then when the engine warms up again the bottle fills up and overflows some of the coolant out of the ..., Pushing coolant thru overflow. Ok I’m new to this forum but I have a 07 Chevy duramax lbz classic body style. I can be just driving it and it’s random sometimes it does it the day after I add coolant or week later. I can be driving it and stop somewhere and leave the truck running when I left the truck temp was 210, I get back in and it’s ..., Coolant pushing from. 2018 kenworth t680 isx Cummins. Coolant pushing from expansion tank to overflow tank. Things I've tried to fix it. New expansion/overflow tank, new caps, new egr, engine overhauled, no overheating problems, started at 200k, overhaul at 560k. Still having the problem., Keeping your computer running within safe temperatures is important, especially as the temperature rises outside. Here's how to make sure your computer's not overheating—and how to..., Coolant Reservoir - Random Issue. 2104 Silverado, had the truck about 8 months now. Randomly, the 2-part coolant reservoir will fill the right side, causing the left side to run low, i get a "Low Coolant" warning on the DIC. Top it up, then it blows coolant out the overflow until the same "low coolant" issue pops up again., May 29, 2019 · Hey guys, I have a 2011 Mack CXU613 with a 455 hp MP8 motor. The truck started pushing coolant out of the reservoir tank when climbing up mountains and long hills. The problem seems to be getting worse. I did replace the coolant tank with one of Ebay some time ago, and its maybe possible that I h... , Im not feeling its a radiator or cooling fan issue at all. Its inside the motor section of the coolant loop. My feelings anyways. I originally felt the running rough could of been a coolant leak inside motor, ie a blow head gasket or the like. But with no signs on the plug or wet/coolant coming out of the exhaust Im not thinking thats it., Fill the radiator, Install a cooling system pressure tester and pump it up to around 10 psi. Start the engine and rev it up and down, watching the pressure gauge carefully. If the gauge jumps up a little every time you rev the engine, you have a blown head gasket or cracked head…. cappy208 September 20, 2010, 6:29pm 9., Remove radiator cap. Start the engine. Add coolant as needed, all the way to the top. Allow the engine to warm up. Look down the radiator neck, if you see bubbles constantly coming up, you probably have a head gasket problem. If you don't see air bubbles coming up, then you might have a very little coolant leak in the middle of the radiator or ..., 08' F250 4x4 w/ 3:55's. Like. B. Bernie Discussion starter. 36 posts · Joined 2008. #7 · Jul 24, 2009. If i run it hard from 0 to 100mph or on the hight way passing hard it will blow coolant out the overflow cap. driving around town its fine only when it driven hard it happens. Like., If your Honda Accord is overheating, the cause could be any of the vital elements of the cooling system. Those elements are the heat exchanger, fan, water pump, thermostat and cool..., Jul 26, 2011. #1. My MF 30B, Perkins AD 3.152, has coolant draining out the radiator overflow tube. It seems the prior owner solved the problem by installing a 150 degree thermostat, and a 13 lb cap, because I just installed the MF correct 180 degree thermostat and 7 lb cap, and the fluid is just pouring out the overflow tube., This started out with the fan not kicking on at 210*, coolant temp got up to 225 on me, and for the rest of the trip I drove it gently to keep ECT down. I figured if it ended up being an issue I could pull over and unplug the solenoid on the front cover and force the fan on all the time., Inspect the gasket on the cap. It needs to form an air-tight seal, or else the unpressurized system will coolant to boil off at lower temperatures. As others have suggested, check for radiator kinks, fans, and if all else fails, replace the thermostat. Most importantly, CHECK THE WATER PUMP AREA FOR LEAKS., Noticed a leak. We took the front end of the car off to see where the leak was. Only to find that it was only coming from the overflow Coolant tank. Checked the spark plugs, compression test, and then finally started lookin around the radiator cap. The one on the top of the pic, is the old radiator cap. Which has lost the middle., Jun 2, 2018 · Temps outside going down 85 to 90, lost just over a gallon of fluid then. Temps coming home, around 70 and raining, short of a gallon used to top off. Both times, had display up, max temp showing in display, about 205, most of the time around 190. Chris . Sandpiper 379 FLOK, Volvo 2012 730. , Jun 3, 2013 · The coolant was being blown out of the over flow bottle. Upon removing the head. We noticed 5 of the 6 injectors had failed. The tips of the injectors had discentigreated. We have no clear indication it was the head gasket, we gave it a full visual inspection. And found nothing that jumped out at us. According to the driver the truck was ... , Right above where your headers connect. It's greenish in color. Remove radiator cap first. Crack that screw or remove it and don't lose the tiny washer behind it. If there is air you should hear it hiss when loosened. Let some coolant come out and tighten it back up. Manual states a little different when doing it but that should tell you if ..., 08' F250 4x4 w/ 3:55's. Like. B. Bernie Discussion starter. 36 posts · Joined 2008. #7 · Jul 24, 2009. If i run it hard from 0 to 100mph or on the hight way passing hard it will blow coolant out the overflow cap. driving around town its fine only when it driven hard it happens. Like., 36191 posts · Joined 2008. #2 · Aug 15, 2016 (Edited) IMO you have blown a head gasket or have a head issue. the fluid test they did is just not reliable on a 6.0. the amount of coolant your loosing is a lot. I would jump on verifying your issue. for the money you spent on the test you could have put a gauge on the cooling system to monitor ..., 18. Ohio. Jun 16, 2020. #2. deadliftdiesels said: Hello everyone, first post here. I own a 2015.5 LML Denali w/ about 61k on the clock, recently the truck was fully deleted including EGR/cp3 swap/ezlynk etc. Shortly after driving the truck home i received a low coolant light and was told to expect this potentially as it is a common occurrence., Apr 30, 2016 · 374 posts · Joined 2011. #1 · Apr 29, 2016. I have a 2008 Kenworth T800 with a 475 ISX Cummins that is getting motor oil into the coolant system. It seems to be getting worse as the coolant is turning a darker color all the time. I have removed the overflow tank and cleaned it out but after a couple times of use the coolant is back to the ... , They are a lot cheaper to fix than replacing the tank itself. Otherwise, the cost to replace a radiator coolant overflow tank is anywhere from $90 to $260. The parts cost will be between $50 and $150 while the labor costs will be anywhere from $40 to $110. On many vehicles, replacing the overflow tank is an easy DIY job., How much does Party City charge to blow up balloons? We have information on availability and pricing. Does Party City fill balloons? How much does Party City charge to fill balloon..., After that, for me, the 'trick' was to: 1) Make sure the coolant overflow bottle is filled to the max level. 2) With the engine cool, top up the radiator with coolant and install the radiator cap. 3) Start the engine. 4) Let the temp get to about 180F - 190F. 5) Shut off the engine and let cool for about 30 minutes., Well, I had just bought a used 379 with a Cat bridge engine with 240 000 miles on a new head/gasket/o rings/liners-UTP had just ran out in Nov 09. Noticed that when I got her home it had coolant leaking from rad overflow hose. Stuck hose in some water and bubbles are blowing out. Did notice cap was 7lb and was told it should be a 16lb cap., The blow-up of meme stocks is another sign of a short-term market top, writes James "Rev Shark" DePorre, who says those who chased some of the highest risk situat..., Coolant filling up the overflow jug and not sucking back within 12 hrs means your head gasket is toast. Anytime you replace a failed head gasket you will need to send the head out for machining unless you want to do it all over again in short period of time. CD. 2008.5 2500 QCSB 6.7L 4x4 SLT Bighorn 68RFE 285/70R17 3.73., Car overheating, coolant blowing out of overflow. Fan runs, but reclines in minutes, pressure build up in coolant hoses, computer says head gasket or cracked head Posted by darknherenow on Jul 11, 2012. Want Answer 0. Clicking this will make more experts see the question and we will remind you when it gets answered. ..., Diesel engine (John Deere 6068 ). Open radiator cap. Start the engine cold. One person watches the fluid in the radiator while another person guns the engine and then drops it back to idle rapidly. The water bubbles in the radiator when the gunning/idling occurs but it is not bubbling otherwise. I say it's not a sign of a blown head gasket., When towing a decent load (37' 5th wheel toy hauler) with in a hour, the low coolant light comes on. It is being blown out of the tube on the overflow tank. I have to be super careful taking the cap off, because there is so much pressure building up that it will blow the cap out of the air and shoot a geyser of coolant 15' in the air., Im not feeling its a radiator or cooling fan issue at all. Its inside the motor section of the coolant loop. My feelings anyways. I originally felt the running rough could of been a coolant leak inside motor, ie a blow head gasket or the like. But with no signs on the plug or wet/coolant coming out of the exhaust Im not thinking thats it.