Question about 2004 Pontiac Sunfire

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2004 sunfire cooling is always on when the car is running

Cooling fan is always on when the car is running and the car cannot seem to gain heat even ice cold the fan is running

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  • 141 Answers

The cooling fan is controlled by a temperature switch located on the radiator or on the engine. When the temperature of the coolant exceeds the switch temperature rating, the switch closes and energises a relay that switched a voltage to run the fan and it will continue to run until the coolant temperature drops back below the opening point of the switch. In your case, you may need to have the cooling fan replaced.

Posted on Nov 22, 2013

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Posted on Jan 02, 2017

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  • 188 Answers

SOURCE: 1999 pontiac sunfire over heats vents blowing cold air

Take the inlet & outlet hose off of the lines feeding your heater coil, where it come off the motor. Do you have good pressure on your water supply to your house????? If Yes. Flush the water thru the heater hose backwards from the diterction that the water normly flows from your car motor. Alot ot the time your heater core will just be plugged up and need to be backflushed. Also make sure that you do not have trash/ leaves in your heater box?????
You can also later on after flushing the H-core out, you can flush your motor, radiator & heater coil by dropping everything out and add water plus 1-can of old style Comett. This is very abrassive!!!! Run the motor for about 1-hour. Then drop all of it out. Put just water back into the system and run again about 10-minutes.Do this flushing about 3-times. You will see how clean your radiator will be, plus the cooler your motor will run.

Posted on Feb 03, 2009

gypsycat00
  • 224 Answers

SOURCE: cooling fan

Yes, it's probably the PCM. I had the same problem, and upon replacing the PCM it started working again. If your cooling sending unit is new, and so many parts of your fan assembly are new, it's probably not receiving the signal from the sending unit. Hope this helps.

Posted on Jul 22, 2009

  • 6982 Answers

SOURCE: Sunfire overheating, not low on coolant

Sensor on the engine sends info to the computer that triggers fan relay and sends power to fan. Most often problem is sensor or relay but quick check fan itself by hot wiring it to the battery Polarity is not an issue...if you get wrong it will run backwards. If it does not run, it's bad.

Posted on Jul 30, 2009

  • 366 Answers

SOURCE: My cooling fan motor isn't turning on my 2004

check fan fuse,if ok conect batt. volt.to fan,if not working,remove bolts from fan shroud and slide fan assembly out,undo motor from assembly.but if fan works,unplug coolant sensor,if fan starts,its the sensor,if it doesnt,check relay and circuit.

Posted on Sep 26, 2009

hotrodshop
  • 106 Answers

SOURCE: I have a 2004 Pontiac

Sounds like your cooling fans on the radiator are not working. The fans are activated by a thermol switch on the engine or radiator reading the coolant temperature and an A/C switch. When the coolant is too hot the fans should activate cooling the system down. And, when the A/C is on the fans should also activate in order to cool the condensate so the A/C would work.

When you are driving, the movement of the vehicle throught he air is providing enough air flow to keep things cool and functional.

I would check the radiator fan fuse or fuses first. If those are OK I would try to run the fans with 12 volts and a ground that I supply just to see if the fan motor(s) actually run when powered. If the fan don't run when powered then the fans are bad and will need to be replaced. If the fans do run when you power them manually, then something is not allowing the power to activate, like a relay, control unit, or wiring.

It will take a little diagnostics, but it is not too difficult to chase it down.

Posted on May 03, 2011

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1 Answer

Why does cooling fan run constantly on 2004 pontiac sunfire


Have you checked the ecm for trouble codes ? The fan runs all the time as a safety to try to prevent the engine from overheating.

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You are right,seems like it must be the control switch to me

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A/c and car over heating


sounds like your cooling fans are not working. look under the hood with the a/c on and check if your electric cooling fan s are working. they are mounted to the inside of the radiator.

Jul 10, 2010 | 2004 Pontiac Sunfire

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Where is the location of the fan heat sensor to turn the fan on when it gets hot on a 2002 Sunfire 2.2 engine ?


Both the 2.2 and 2.4 liter engines use the computer to turn the fan control relay on and off. The computer gets it's temperature information from a coolant temp sensor that is dedicated just to telling the computer what the coolant temperature is. There isn't a seperate sensor or switch just for the cooling fans on either engine. It's very rare for the coolant temp sensor to fail and when they do there is almost always a corresponding performance problem as the computer no longer knows how cold or warm the engine is and will turn on the "check engine" warning lamp and set a corresponding service code. If the fans aren't working I would look first for a blown fan fuse [usually 30 amps or larger] or you could possibly have a bad fan motor. When working properly these cooling fans don't come on until the engine reaches about 218 degrees and then go off again as the temperature drops to about 210. The fan should come on anytime you have the a/c running while the vehicle is sitting & running as it needs the fan to run to remove heat from the a/c system. Once the vehicle is over about 35 mph the fan rarely comes on as enough air is being forced through the radiator and condensor to cool everything properly.

Jun 08, 2010 | 2002 Pontiac Sunfire

1 Answer

02 sunfire overheating


make sure you have radiator full of coolant
run the car to operating temperature
check the operation of the cooling fan
feel the upper radiator hose and the lower radiator hose. they both should be hot.
if one is cold then you may have a bad thermostat or restricted flow
if cooling fan does not come on when engine is hot then you have bad cooling fan switch, relay or motor.
good luck

Mar 07, 2010 | 2002 Pontiac Sunfire

2 Answers

Fan runs after car shut off


You may need to replace your thermostat. This is normal for the fan to run after you turn your car off but if you say its running for 20 minutes or longer, it may mean your thermostat is stuck and causing the fan to run longer to cool off the radiator. Its a good thing for the fan to run. Heat is your enemy. I rather the fan run than no fan at all, if your car overheats, you could blow a gasket or warp your valves and its really pricey if that happens

Nov 25, 2008 | 2002 Pontiac Sunfire

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