Question about 1995 Pontiac Firebird

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V6 engine cooling boils over when car is turned off,engine temp is 230 fan comes on and 220 when it goes off. new radiator cap.

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Stuck thermostat

Posted on Jul 17, 2009

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I have a 02 Grand caravan that has new radiator, termostat, one new fan. the temp gauge goes up to max hot the drops right back down in seconds. what could be the problem?


it could be you have an air lock in the cooling system
remove the rad cap from the rad, start the engine and let it run until the coolant drops (add to fill it back up) or until the coolant boils out of the rad spout.

maybe pull the heat sensor. -replace it OR clean it off, reinstall it.

Mar 12, 2015 | 2002 Dodge Grand Caravan

2 Answers

New radiator cap, now engine over heating - subaru forester 2004


If the engine was stopped or you shut it down immediately then the possibility of damage would be remote as the piston would not be continuing to move which is where most damage occurs.. If the radiator failed a pressure test then the problem is that the radiator pressure was not high enough to prevent the boil. I will explain . Water boils at 100degrees c at 14psi (air pressure). When under pressure the boiling point goes up to well above the 100 degrees . If you have a coolant system leak the pressure will be at air pressure and when the engine is stopped the hot parts have not water circulation so the temperature goes well over the 100 degrees and so it blows off . 2 problems are present that you have to correct. Find the leak and have it fixed and secondly check that the cooling fans are working correctly. Caps come in varied pressure ratings for the radiator construction so check that the cap reading is suitable for you vehicle

Jul 17, 2013 | 2004 Subaru Forester

1 Answer

Engine cooling fan will not opperate


check that you have a thermal switch to switch on the fan and not a temp sender unit. One completes the curcuit when a set temp is reached ,the other is a resistance unit that lowers the voltage which in turn reads hotter on the gauge.

Jan 17, 2013 | 1996 Ford Thunderbird LX

4 Answers

I have a 2003 subaru outback 2.5 have had head gaskets replaced, new raditor, replaced thermostate, heat gauge still shows it getting hot UNLESS I turn on the heater fan, doesn't matter where temp is set...


Terry, what's happening, is when you turn your heater on, no matter what temp you have it set at, the vehicle allows coolant to pass through your heater core, and the blower motor acts as another cooling device for the anti-freeze. The next steps I would take, is to check your fans. Let the vehicle warm up a bit, and look under the hood and see if they are turning on at all. If they are, next, you may need to flush your entire cooling system. First start with the radiator, and if that does not help, you may need to flush the entire system, which flushes water jackets throughout the engine, AND the radiator at the same time. Now, if you are not seeing bubbles, (check under the radiator cap also), I would doubt it is a crack anywhere. Take the first steps I gave you, and see if this fixes the problem. Hope it helped you out.

Feb 26, 2011 | 2003 Subaru Outback

2 Answers

I have a 1999 Cadilac Deville that I replaced a


Are you sure the thermostat was in the wrong way ?.

The thermostat is located in the bottom hose unlike most conventional cooling systems.

The thermostat in the Northstar engine is a dual action device.
One end of the stem is the Thermostat(obviously) and at the other end is a spring loaded pressure valve(the thinner end).

Make sure the thermostat end is nearest the rubber hose and the pressure valve end is in towards the engine.

Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

For overheating problems consider the following......

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

Jun 30, 2010 | 1999 Cadillac DeVille

1 Answer

My 1998 buick regal non turbo 3800 radiator cooling fans will not work when the car gets to operating temp. The fan motors will work whtn the AC is on. I think it could be the temp sensor that turns on the...


the electric cooling fan for the radiator will not turn on when the engine reaches normal operating temp, its only supposed to come on if the engine temp goes over the normal temp. (around 220 degrees)
it is normal for the fan to come on any time the a/c or defroster is turned on.

Oct 12, 2009 | 1998 Buick Regal

1 Answer

Cooling fans only run when gear is in park


Looking at a wiring diagram I see two relay's that control the cooling fans (has two ) High speed cooling fan relay , low speed cooling fan relay . Both relays are controlled by the PCM - engine computer . Your best bet , have it checked for DTC'S - diagnostic trouble codes . Could have control circuit problems .There are videos on youtube test relay controlled circuits . How to test at the relay base (where relay plugs into ) Test power an grounds an control . Do you know how the cooling fans work ? Coolant temp. sensor inputs temp to PCM . When coolant temp reach's 200 to 220 , the PCM will energize the relay's low speed then high if temp fails to come down . Can check this data on a good scan tool . Can even turn the fans on with a good scan tool .

Mar 05, 2017 | 1999 Ford Taurus

1 Answer

4.6 lit cadillac overheats although I replaced the thermostat


did you try replacing the radiator cap and the temp sensor?

Mar 31, 2009 | 1997 Cadillac DeVille

2 Answers

Were are the sensors for the engine fans in a nissaan sentra gxe


One of the common things that gets missed at times is the radiator is down in cooling antifreeze. The car will act as normal during the warm up cycle and then the temperature guage will rise and then it will slowly come back down as the thermostat opens and/or the electric cooling fans come on. In actuality the engine is overheating, but it is not boiling over. The level of abtifreeze is at just the right level of lowness that you experience this phenomenon. After the engine cools off , (DO NOT REMOVE WHEN HOT - YOU CAN GET SCALDED WITH BOILING WATER/ANTIFREEZE)), remove the radiator cap and check the level within the radiator and also the antifreeze reservoir level. You can buy a 50-50 mix of antifreeze and water that is ready to put into the radiator. If the level in both the radiator and reservoir are correct, you may have a bad thermostat or some other problem.
Bob - 2003 Nissan Sentra SE-R SPEC V

Nov 25, 2008 | 2003 Nissan Sentra

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