Question about 2003 GMC Yukon XL

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Increase of engine temperature while AC on and when idle or slow moving traffic? 70 k miles 2003 Yukon XL 4x4, Fan clutches replaced and problem still exist

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It is normal for a vehicles engine temp to increase while using the air conditioning. but if it is actually overheating or giving you a temp waring then you might need the radiator serviced or possibly just spray the dead bugs out of it with a sprayer. if the air can't flow because of dead bugs then it can't dissipate thew heat very well, but at highway speeds the airflow is great enough to make up for the blockage.

just a thought, hope this helps

Posted on May 21, 2011

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Posted on Jan 02, 2017

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Dodge 3500 w Cummins,Does not get hot when towing or going down the road. Water temp goes up when moving in slow traffic or stopped, idleing, AC stops Don't think clutch fan is locking in


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The AC cooling ok, but has noisy sound.i have replaced the adjusting pully with the belt. and the noise still same,also noticed when AC on it cause load on the engine which i can feel. CAN YOU HELP AND...


it sounds like your ac pump clutch bearing are sezing up they will be noisey and the ac take around 30% effiencey from your engine when on so if the bearing are sezing up that will increase thats why you feel the car has a load on the engine

Aug 29, 2010 | 2003 GMC Yukon XL

1 Answer

I was traveling 5 to 10 miles an hours due to traffic for about 30 minutes. The aircon was on almost at the same time then suddenly, the engine temperature gauge went to red zone, which denote overheating....


When the Ac is put on the radiator fan would be working almost all the time. since you had been idling in the slow traffic there was no enough ventillation for the condenser to maybe shut off the AC and made it work hard. It is important to check if your radiator and cooling sections are alright. If in the first place there was less water inside, if so there would have been build up. Next if the radiator was blocked from the front it would have choked the cooling and resulted in the engine temperature building up. Please check for leaks in your radiator, flush the radiator and fill up with new coolant. check the pressure cap of the radiator for any fault replace.Finally check the engine performance , correct tuning/ timing , fuel supply.After you have identified any of this start the car and put onthe AC and put it on idling, check after 30 minutes for the radiator fan to cut off - the thermostat working fine- to finalise our fault. Hope this helps? Good day

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How many miles are on the vehicle??? Is the coolant level full???

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2003 yukon stalls in traffic


sounds like a spark timing issue. dist/coils or plugs. the only other thing and this is weird-the coolant temp sensor

Oct 08, 2009 | 2003 GMC Yukon XL

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1989 Toyota Land Cruiser overheating- REPLACED ENTIRE COOLING SYS


Do a cylinder leak down test. Hook up a airline to each spark plug hole. Bring each cyclinder to tdc and listen for air leak. Possibly in the radiator. You can also reverse the process by doing a radiator leak down test. If you hear bubbling in the radiator bad head gasket. Remove and replace head gasket.

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Overheating when outside temp goes above 90 degrees F


on GM vehicles they still use clutch fans and when sitting at an idle for a while the fan is not pulling enough air through the radiator and condensor so therefor the a/c starts to put out warmer air and the coolant temp. will rise a little bit. You could try replaceing the fan clucth and see if that helps any.

Jun 09, 2008 | 2002 GMC Yukon XL

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