Question about 1999 Buick Regal

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Overheating car will shut off after 20 min will run again

I see alot of ppl having this problem and it seems to be the cooling fans are not turning on once the car gets to a certain heating point, also the thermostat could be clogged not running the water through the engine ...I HAVE THIS PROB WITH MY CAR..so you can run a switch to go under your dash to where every time you start your car you just make sure you flip that switch to ensure the fans stay on to cool your car...BUT MAKE SURE... you turn the fans off when you shut your car down

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Maybe replacing the thermostatic fan switch would fix it.

Posted on Sep 23, 2009

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The electric radiator fan runs after truck is shut off. Will turn off after 30-40 min. Is this normal?


no it is not normal....have a repair shop check the coolant fan sending unit or the coolant fan relay...a bad sending unit maybe sending a false overheating signal to the fan causeing it to stay on or the on off fan relay maybe sticking on..an make sure the jeep is not actually running hot the temp guage maybe reading the wrong temp

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When I turned off my 2000 Honda Accord the other day one of the fans kept running and ran for about 20 minutes before shutting off. The car seems to be running fine now but I wondered if I should have my...


The fan running and staying on after the vehicle is shut off is sometimes normal to a point. Meaning that if an engine is to hot, low on coolant then the fan will come on and stay on to help cool the engine down after the vehicle has been shut off. But for it staying on for 20 minutes is not right either. I would wait and see if it happens again, if it does then I would have either a Mobile Mechanic or a shop look at the car to figure out why it is staying on.

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Hello... I got problem with my honda odyssey. For the past 3 days, if i start the engine, after 5 min the temperature will goes up to HOT and engine indicator light-up. I turn-off the engine and then start...


Your English is very good.

From what you have described, which is a rapid over heating of the radiator coolant fluid and therefore a hot engine condition, it would appear that the thermostat in the engine's cooling system is faulty.

If the thermostat is sticking in the closed or nearly closed position temporarily, there will be no flow or very little coolant flow between the engine and the radiator and the engine will overheat.

You have advised that after the engine is shut off , and radiator coolant fluid has cooled, you re-start the engine and drive the car without the overheating condition occurring again and the radiator coolant temperature is normal. This time there is no overheating because the thermostat is working normally.

You should have the thermostat replaced as soon as possible because allowing the engine to overheat can cause very expensive engine damage.

If you had a continuing overheating condition then I would suspect both the thermostat and the water pump. However as the overheating seems to be only temporary, and clears itself after you have shut down the engine and re-started it 10 minutes later (without further overheating arising) then I think you only have a faulty thermostat.

Please also check that the electric fans which draw air through the radiator are operating. These run on a temperature sensor and will switch on automatically once the radiator coolant fluid reaches a certain temperature and then switch off again when the fluid temperature reduces. You will hear them running once they start up. If these fans are not working the radiator coolant can quickly overheat in various driving and temperature conditions because there will be insufficient air flow through the radiator to cool the fluid. If the temperature sensor is faulty or has died, or if the electric motors running the fans are faulty, the fans will not operate.

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It could be the program in the ECM where it may run for a few min before it's commanded by the ECM to shut down or the other thing is the radiator fan Relay may be bad and is sticking in the close loop position and needs to be replaced. A bad Relay may get stuck in the open loop and your not going to have an cool fan working, causing overheating in stop and go traffic. Good luck and hope this helps. 

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Thermostate ranges from overheating to just fine while driving.


is the fan working? if the fan isnt working it will overheat when idling, as it wont be sucking cold air through the radiator. a quick way to diagnose that your cooling system is fine is when stuck in traffic, turn your heaters onto hot, if the engine temp gauge shows that the engine is cooling down, the cooling system will be fine 9/10 times.

hope this helps.

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