Question about 2004 Pontiac Grand Am

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Cooling system fans quit working and it over eats now

Cooling system fans quit working and it over heats now

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  • Anonymous Feb 25, 2009

    they just stop working why?

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Check the sending unit near the out put hose for the radiator on the head one wire or two will go to it. it screws in to the head. or check the relay under the hood in the fuse box.

Posted on Jan 08, 2009

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My lincoln ls V8 sport overheats when the heater is off but works fine when the heater is on. My lincoln with the heat off while on the highway will not overheat but soon as I get off the highway on to...


This means your cooling system is not working properly. First check your coolant level, this is the most common cause of overheating. Top it up if necessary and watch it for the next few days, refilling when necessary.Take a water hose or air hose and clean out the cooling fins on your radiator, paying close attention to the lower rad. Quite often they get plugged with debris and will imair your cooling ability. Blow out from the engine side, this way you are going against the flow and it should clean easier. Next, let it heat up and watch to see if the cooling fans come on. There are a set of temp sensors to turn them on and off so this problem will likely need to be sorted out by a mechanic. It could also be that your cooling system is partially blocked, which would suggest that a flushing is in order.

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Why is my ex 30 over heating


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2004 grand marquis fan quit working..replaced fan but still wont work


is this the blower motor fan for you heating and A/C or the cooling fan cooling fans have a relay blower fans are fused but controlled from switches inside as well as fuses

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2001 town&country had replaced radiator but now fan stop working van is not over heating and heat is good hanve no other problem just fan s not working olease help me to find out waht could be problem


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Why does the fan keep running on 2005 jetta after turning off


You are talking about the thermo electric cooling fan, its operation is independent of the car's electical system. It is switched on and off by the engine temperature. When you park, the engine heat soaks upward to heat the thermostat turning the fan on. It will run until the engine cools down and the thermostat switches it off. Quite normal operation.

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1 Answer

Soon as i turn on my heat my cooling fans come on first


It sounds like you do need a thermostat with your heat shut off and the gauge will raise a little then the car doesn't have that heat drawn from it indicating that you most likely do need a thermostat. As far as the fans coming on immediatly that could be a different problem it is most likely the coolant temperature sensor that tells the fan's when to come on. If this sensor says the coolant is hot the fans will come on immediatly. These are seperate problems as the coolant temperature sensor does not have anything to do with the cabin heating system. You should first check the level of your coolant is full, This could also cause your cabin heating system to perform poorly, and may have adverse effects to the engine cooling system. (fans)

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1997 Mercury villager, Air conditioner was working, now compressor kicks on and off, shows over charge in the red, why? Nobody added any freon.


high pressure is usually from heat not being removed from freon in the condensor. Usually it's because the cooling fan is not sucking air through the condensor. Check your cooling fan relays (3) in the battery box in front of the battery. Also, check to see if cooling fan has failed.
Does it work ok when the engine is cold and then quit after engine warm up? That would be a clue. When pressure gets too high, there is a high pressure cut-off switch.

Other posibility is a restrcition in the system. not common though.

go here for more help

http://groups.yahoo.com/group/villagerquest/

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I agree with philip, i have not studied the electrical system. but to my best guess the electric fans are tied into the engine cooling system. when the engine is not requesting the fans to come on. then their is very little air passing threw the cooling package. When their is no cool air passing by the condenser this will not draw the heat out of the refrigerant leaving excess heat in the system and when the cab fan blows this is were the excess heat is getting dumped. then at higher speeds their is enough air passing threw the condenser and radiator to cool them both.

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Over-heating issue


2000 LS cooling system is a very tough system to diagnosis. Any kind of air in system will totally stop the flow and cause it to heat.That is the reason it has 2 places to bleed the air from the system.The one at the engine where the upper hose connects and one beside the brake booster near the degas bottle(rubber tube with a screw end).
The cooling fan is also hydraulic and has it's own power steering pump.
The good thing about this system is that it uses a cylinder head temp sensor that measures the metal temp and not engine coolant temp. When the PCM sees the CHT reach a certain temp it will start shutting down 4 cylinders at a time and use these cylinders as actual air pumps to help cool the engine down.If this does not work it will then shut the engine down totally until the temps come back down.

The most common problems we see are thermostats,crack degas bottle,or a leak somewhere,and of course air in the system. Have not seen a cracked head yet however did see one that pushed the plug out of the cooling port in the head but this also filled the oil with coolant.
Have also seen cooling fans that would not work until PCM demmanded high speed,caused by a weak power steering pump.

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