Question about 2007 Pontiac G5 Gt Coupe
Typically the temperature in my car used to stay between 190F. and the high end of 200F. at which the cooling fan would switch on and cool things back down to normal. Now I am getting readouts as high as 217F according to the coolant temp readout on the instrument panel. I checked the relays and the fuses in the fuse box under the hood and they were all good. The fan turns on when you switch the A/C on but under no other circumstance though it will stay on after the A/C is switched off again. Coolant is at the normal cold fill line, radiator has no dents or leaks, and fan seems to pull in plenty of air when it is running. I'm not sure what to try next other than paying extremely high prices to have it looked at.
There are many possibilities for car overheating.
Faulty thermostat,clogged radiator/plugged radiator,radiator hose worn out.Coolant running low.Low coolant pressure.Faulty temperate sensor.
I suggest you to go through the troubleshooting details mentioned in the link below:-----
All types of car overheating problems and troubleshooting?
----------These will help.Thanks.
Posted on Nov 29, 2012
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Posted on Jan 02, 2017
SOURCE: cooling fan not working
The fans only run when the engine reaches approxminatly 235 degrees F. on the guage that is near the end of scale just before guage show "HOT" I don't think you have a problem, allot of folks out there don't know about this.
Posted on Aug 22, 2008
YOU NEED TO REPLACE THE UPPER INTAKE MANIFOLD. ALSO, YOU WILL NEED TO REPLACE THE LOWER INTAKE MANIFOLD GASKETS. THIS IS A MANUFACTURING FLAW. THE PLASTIC INTAKE CRACKS CAUSING AN INTERNAL COOLANT LEAK. YOU CAN RESEARCH THIS ON LINE.
Posted on Apr 30, 2009
These fans should turn on at about 220 degrees, give or take a couple, and then turn back off at about 210 degrees.Fans should also come on when engine is idling with the a/c on [provided the a/c works of course] If the fan[s] isn't running and the gauge is over about 3/4 of the way or will go all the way to the end then odds are your fan's aren't capable of working for some reason. The classic symptoms of a cooling fan not working are what you are describing: Cools fine at highway speeds, overheats at slow speeds. I would start by checking the cooling fan fuses located in the underhood fuse panel. I believe they are marked Cooling fan 1 and Cooling fan 2 and both should both be 30 amp fuses. If the fuses are good then you might have problems with the fan motors themselves. Hope this helps you get it working again!
Posted on Jul 15, 2010
It doesn't matter if the engine is hot or cold when you bypass the relay. The fan should come on. Did you try both ways on the relay. One way is for the fan the other is from the computer. just to make sure. If the fans do not work then it is most likely the fan. I would check the fan when I had it apart. to hard to do it in place. you don't want to replace it if it is not bad. It could be from the computer side . ie. bad connection, bad computer, bad wire. need to check. also to check the relay connect a wire to prong # 30 and #87 Between + and -, you should hear it click, and while it is connected there should be continuity between prongs #85 and #86. Randy
Posted on Nov 10, 2010
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