Question about 1989 Jeep Comanche

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Water boiling in the coolant reservoir. - 1989 Jeep Comanche

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Sounds like a blown head gasket,maybe thermostat stuck if you are luckey

Posted on Aug 30, 2010

  • phase3pro Aug 30, 2010

    Already resurfaced head installed new head gasket, freeze plugs --- still boiling water in reservoir



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I drive a Camry V6 3.0L Every time I top up the coolant to the recommended level and after driving the contents in the reservoir boil over and spill out.

There may be a slight head gasket leak to the coolant jacket, not large enough to overheat the engine. It is normal for some coolant to escape at operating temp, but not lots, and it should cool down to about the recommended level again.

Something is pressurising the coolant jacket. Have it tested for the presence of combustion gasses in the coolant. This is a simple test.

Another thing, that model often develops a crack in the radiator plastic top tank. It is not the problem here, but worth knowing.

Oct 29, 2016 | Cars & Trucks

2 Answers

My 2002 saturn boils over but does not overheat sometimes i will drive across town and all is fine sometimes i will drive 7 miles and reservoir will boil guessing thermistat water pump or cap

Of the water is boiling them it has run hot. There is no way around this fact. Get a compression test done first. This should reveal if any damage has been done. Then address the boiling off problem. This can be a air pocket in the line, incorrect anti freeze mixture, sticking thermostat, water pump, cap, etc.

Oct 20, 2016 | Saturn Cars & Trucks

1 Answer

How can i stop coolant bottle from boiling and bring out coolant?

Mix new/ fresh coolant correctly, insure water pump is pressurizing system, ensure thermostat is opening, and then ensure that you have flow throughout your system.

Note: If you have a blown head gasket, your coolant may not actually be boiling, but releasing the compression from your cylinder(s) into your cooling system and blowing air out of your reservoir.

Nov 21, 2013 | 1999 Dodge Durango

1 Answer

2001 Chevy Lumina. Got hot, pulled over. Reservoir was boiling over but radiator cap was cool to the touch. Let it cool off. Check water in radiator and reservoir, needed very little. Started driving and...

Sounds like your thermostat is sticking closed at times, not allowing coolant to circulate through the radiator for proper cooling. Replace thermostat.

Mar 01, 2013 | 2001 Chevrolet Lumina

1 Answer

2004 explorer 4.0 coolant reservoir boils over when stabolized at normal level, no heat when level drops temp indicator normal

go to autozone rent the free tool called a block tester buy the fluid for it (about $8.00 us)drive the car make sure the resivour is about 3 inches down so you dont suck any fluid into block tester. pour blue fluid into block tester put it in antifreeze resavour. squeeze bulb sucking air from resouivour for up to 2 minutes if fluid turns yellow your head gaskets are leaking. I think you may find this to be your problem

Feb 12, 2013 | 2004 Ford Explorer XLT

1 Answer

It is 1997 Toyota Avalon, there is a trace of overflow of coolant from the reservoir tank after test driving.(I wanted to buy that used car). Around the tank and coolant cap, some traces show overflo

The car may have a compromised head gasket, forcing air pressure into the cooling system, displacing water/coolant mixture and forcing it out into the reservoir.

This can be expensive to fix if it's the case, but it could be that it has a faulty radiator cap also.

does it have proper antifreeze/anti-boil mixture, or just plain water?
if it's plain water, it may indicate that this is an ongoing problem that the current owner hasn't fixed.

Check the cap and see if it seems loose, the spring inside should be firm, and the inner sealing ring (rubber) should not be cracked or damaged. if the system is leaking, this can cause similar issues where the coolant boils off into the reservoir.

if the cap seems fine, it will likely be a blown head gasket between a cylinder and a water passage, the problem will continue until the gasket is replaced.

Oct 20, 2012 | 1995 Toyota Avalon

1 Answer

92' Ford Explorer is running hot. Changed the thermostat, water-pump and flushed out cooling system. The coolant is boiling in the radiator, and overflowing out of the coolant reservoir.

sounds like a blockage like a dodgy thermostat, id test it by boiling a jug and throwing your new thermostat in the boiling water and see if it opens, other than that you've pretty much done it all so id be looking at a blown head gasket. good luck :)

Jun 28, 2011 | 1992 Ford Explorer

1 Answer

Over the winter my water flange on my 2000 VW beetle, cracked. We noticed once the car over started flashing the high coolant temp alarm. I replaced the flange and re filled the engine coolant, now it...


i hate to be the bearer of bad news, but you may have a blown head gasket.

the coolant is probably not boiling in the reservoir, but if the head gasket has blown by a cylinder, some of the gas is escaping form the cylinder and bubbling up through the coolant.

a pressure check on the cooling system will confirm this, but you could also check the exhaust gas.
if it is white in colour, or has a sweet sugary smell, then this will mean that coolant is also being burnt in the cylinder.

please feel free to ask of you have any more questions.

May 25, 2011 | 2000 Volkswagen Beetle

2 Answers

My 1995 325i overheating and the gauge flactuates,i replaced thermostat already,I also noticed that when im driving and change the gear to4th & 5th on a hiway, itgoes faster tothe red zone. also heater...

your car is severely overheating. take it to a repair shop and have it checked. it sounds like you are low on coolant, if you only get cold air out of vents, it usually means you you have little to no coolant in the system. you could have a lot of air in the system also. try bleeding the coolant system.

Jan 27, 2011 | BMW 325 Cars & Trucks

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