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The coolant boils over when the car has a bit of stick

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Check oil level, if it is OK, the engine head gasket is probably damaged ...

Posted on Sep 28, 2008


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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

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Vy v6 ute i went to check my coolant and there was none in there so filled it up and it started to boil after a bit bit my temp gauge said it was fine and the fans aren't coming on?

have a compression test done as it may not be boil as such but getting compression pressures into the coolant system from a blown head gasket or cracked head

Mar 29, 2014 | Cars & Trucks

1 Answer

2002 freelander land rover coolant boiling in reserve tank

Hi there the common problem found with your car is one thermostat sizes and will not let the water pass threw this in turn will cause boiling in the head and overflow bottle .2nd have a look at water hoses around engine and radiator they leak a bit , if no leaks are found my guess thermostat

Jan 27, 2014 | Toyota Cars & Trucks

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My 2005 Pontiac Montana occasionally wants to run hot when sitting still in traffic. Had it checked at mechanic and they cannot find anything wrong. Levels are fine, no leaks, fan works. Ideas???

thermostat sticking. pressure cap (radiator cap) to low release pressure. Pressure work like this water boil at 212F each pound of pressure cap = 3 degrees F . then a 15 psi cap is 15 x 3 = 45F so it means that water coolant will boil at 212F +45F + antifreeze boiling point.

Aug 24, 2013 | 2005 Pontiac Aztek

1 Answer

Nissan altima coolant boiling

could be a number of things dose the heater get hot if not thormostat would be my first port of call if that dose not sort it it could be watter pump or head gasket failure presure testing coolant system would help to indicate what the fault is

Feb 18, 2013 | 1998 Nissan Altima

2 Answers

Overheating coolant boiling out into reserve tank

you have a blown head gasket.. doesn't have to have coolant in the oil for a blown head gasket... if hoses are rock hard when running then you have exhaust leaking into the coolant via a blown head gasket...

Jul 14, 2012 | 1998 Plymouth Breeze

1 Answer

97 seville overheats slowly and loses quite a bit of anti-freeze but not smoking,or mixing in the oil and not steaming uot of the exhast.

My first guess would be the cooling system has some air in it from the radiator job, or the thermostat may be sticking.
You say it is loosing coolant, so you are putting coolant in every day or week ? Is it loosing it on the ground when it overheats ?
If you are adding coolant but not seeing it boil over, it could be burning it and you would not see smoke from the exhaust.

Jul 09, 2012 | 1997 Cadillac Seville

1 Answer

Coolant boiling out of reservoir, overheating.

You have insufficient coolant inside radiator that it boiled during running. Just top your coolant to normal level and re try your car. If still boiled you may have : - clog up radiator or - defective thermostat
Check also the radiator and hoses for leaks.

Dec 24, 2010 | 2002 Jaguar X-Type

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If the car is overheating it could be due to a thermostat which is stuck in the closed position, a failed water pump or just a slack belt driving it. I think there will be a "little" tube carrying coolant from the engine to the coolant expansion tank, and if you run the engine with the filler cap removed you should see water coming through that pipe IF the rump is running. A failed water pump will not necessarily leak, it just won't pump the water round the engine.

Always take care when dealing with a pressurised cooling system on an overheating engine - the water may well be above boiling point.

If you run the engine without coolant the cylinder head may well warp and repair bill will be huge.

Hope this helps you a bit. D

Jul 19, 2008 | 2003 Volkswagen New Beetle Convertible

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