Question about 2007 Pontiac G5 Gt Coupe

1 Answer

Car overheats sitting at an idle.

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.

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  • we2184
    we2184 Nov 29, 2012

    Also, coolant temperature goes back down to normal when driving at normal speeds.

  • we2184
    we2184 Nov 29, 2012

    New discovery. I noticed today that it seems like the external temperature reading on the dash is going haywire. I noticed today when it gave me an "ice possible" warning. It was thinking that it was 34F. outside when it was really in the mid 60's. Would it be possible for this to change the cooling program of my car? The car seems to cool itself properly when the outside temperature reading is at a correct level.

  • Michelle Lambert
    Michelle Lambert Apr 16, 2015

    Any luck on finding the problem? This is now happening to my 07 g5

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  • Pontiac Master
  • 5,370 Answers

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?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
----------These will help.Thanks.

Posted on Nov 29, 2012

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Posted on Jan 02, 2017

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emissionwiz
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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

  • 1 Answer

SOURCE: 98 Pontiac Grand Prix Overheating

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

  • 447 Answers

SOURCE: My 2002 Montana Van will over heat while idling,

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

  • 14585 Answers

SOURCE: '97 Pontiac sunfire, 2.2L Problem

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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1 Answer

Overheating when I sit idle.


Over heating the engine is a serious concern. With the hood raised you should hear the motorized fan turn on just behind the radiator as the engine requires additional cooling.. If you look in from the rear of the radiator you should see the fan blades.

This electric powered motor operates on a thermostat and when the engine temperature rises this fan should come on. I'm assuming from your description that when driving and air is flowing through the radiator as the car travels the engine is nor overheating.

Check fan motor thermostat, check fan motor and check wiring.

Wiring Diagrams related to the Honda Civic
http://www.wiringdiagrams21.com/category/automotive/honda-automotive/civic

Motor engine cooling fan only runs as engine temperature requires additional cooling.
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01 Audi tt quattro starts to overheat while idling but coils down after driving at higher speed, is it a thermostat or the fast relay switch


overheats at idle only are typically the fan system. Cars use the fan to pull air across the radiator for cooling. Any speed over 10 mph there is more than enough natural wind to do this without a fan. If the problem immediately goes away when you start moving, it is probably a malfunction or issue with the fan. I have on more than 1 occaision had a customer tell me they had the fan replaced and car was still overheating, and it ended up thje fan was spinning backwards or not turning on because of a fuse or relay issue.

If it doesnt cool down fully once speed is above 20mph for more than 30 seconds, there may be other issues like plugged radiator or weak water pump impellars. water pump is a fan that moves water instead of the air. if the blades wear, they still kinda work, but at idle they work poorly because the broken blades only move a little air at low speed, rev the engine up, they spin faster and work better. If the fan is functioning OK (Turns on and off by itself) and car still runs warmer at idle than at rev, water pump may be worth investigation.

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firstly the the fan will stay on for few time(cooling fan).And its not the thermostat climb its the high temperature indication at the intrumental pannel cluster meter if the temperature indication is too high than there will b any problem in ur car related to overheating may b the coolent leakage or the thermostat valve not working properly

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When idling my jeep overheats. The cooling fan is running and it speeds up when temperature goes up. The temperature gets close to 260 degrees and the engine tries to stall. when I start moving it cools...


At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.

Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.

If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?

It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.

Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.

Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..

The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.

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Check the coolant temperature with the car stopped. At idle with the hood up keep the thermometer in the coolant. Confirm if the coolant is not overheating but the engine is!!

Run the A/C keeping the thermometer in the coolant and allow the fan to kick on.

If with the A/C on the engine doesn't overheat then it confirms that the low speed on the fan motor is not working. Read the description of the Taurus where the low speed is used for normal operation when temperature is required but the high speed is activated when the A/C is on. The circuit is simple.

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