Question about 2000 Pontiac Sunfire

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My car keeps over heating only when in slow moving traffic or idle 2001 sunfire

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Check to see if your cooling fan is working. At speeds above about 30 MPH, the fan is not needed. When you see the engine getting hot (if you have a gauge), then pull over, leave it idling, and open the hood and see if the fan is running. You should be able to see and hear it, just behind the radiator.
If the fan is not running, it is likely the fan relay has failed. It could be the fan thermostat or the fan motor itself, but odds are it is the relay. That is an inexpensive fix.

Posted on Aug 23, 2010

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I have a 2004 Pontiac Sunfire. When the car is in idle the air blows out hot and the Temperature gage rises and the car over heats. When the car is moving the air blows out ice cold and the temperature...


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.

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I have a 2000 Pontiac Sunfire. It keeps overheating. I have replaced the radiator, water pump, a couple hoses, and the thermostat. I ariated it. It still overheats only runs cool if I run it without the...


i'm not being smart, but do you know for sure you are installing the thermostat correctly? the thermostat is there to slow the water flow down long enough for the water to obsorb the heat .also is the cooling fans operating ?do the fans come on at around 210 degrees?is the radiator grill clean? lower spoiler intact? does the engine over heat at highway speeds or while idling? are there any codes?is the engine running lean? possible fuel filter stopped up.fuel injectors dirty. let me know

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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.

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