Question about 2003 GMC Yukon XL

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We have a 2003 Yukon XL. Heard a noise in the fan when the AC was on. Would stop when turned off. The rear air quit cooling, then the front. Is it possible to restore the cooling to get home from vacation? Or do we need to replace a part? Will it be costly? Found out our 6 yr. extended warranty expired two days ago !!

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It look like the belt broke get fixed as soon as possivel

Posted on Jul 26, 2009


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Front ac blower wont shut off after the truck is shut off

This would indicate to me the vehicle has had an issue with the wiring, perhaps an accident in the front end, and someone has hooked up the wires wrong.
The radiator-cooling electric fan can run up to several minutes after you shut off the engine, as it is cooling off the cooling system.
The A/C fan, however, should shut off with the engine.
God bless your efforts.

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There's a rear hvac fuse 30amp that powers an auxillary blower motor processor controller. The controller has the resistor to regulate fan speed. The front and rear fan control both pass thru the front controller first then to the rear processor.
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Could be the blower motor, the resistor, or the control on the dash.
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I have a 2003 GMC Yukon XL. Every summer it seems like the AC needs to be recharged. It remains cold for a while and then it does not blow as cold. It gets cold as I drive faster. Today, the rear AC...

{: ) If there is a leak on the a/c lines, then that could really affect the a/c cooling. The only way to know is to connect it to an a/c machine and observe the high and low side pressures. Recycling the refrigerant may be suggested, especially if the pressures found not normal. Recycling means recovering the refrigerant and charging it with fresh R134a (let's say 1.36 kg). The amount recovered should be as close to 1.36 kg. The higher the difference, the more air has entered into the system, which may cause poor a/c cooling. Usual sources of leaks are the service valves, the fittings, and the a/c hoses' metal to rubber crimping. You may visually inspect for traces of oil along the a/c lines.
But assuming there are no leak issues, you need to check the throttle body for carbon fouling and clean it. Check your front grille, the a/c condenser fins, and the radiator fins for clogging or accumulation of debris. Check your engine cooling fan for bents, cracks, or silicone leakage. Off course let's not forget the coolant.
You said it gets cold as you drive faster. Just think about it. There's a big difference when the vehicle is running on speed than idling and moving on traffic. When running, air velocity helps in lowering heat on the condenser and radiator. Since temperature and pressure are directly proportional, high side a/c pressure will follow at desirable levels. This improves a/c cooling, even though the a/c is slightly low on refrigerant. Moreover, when running at speed, the engine rpm is higher. The a/c compressor will pump faster thereby improves the cooling as well. When the engine runs on idle, heat management depends only on the coolant and cooling fan.
You/re rear a/c is a separate issue. It could be a faulty rear blower fuse or resistor, and that's the usual cause. You need to address first the main a/c cooling performance issue before you focus on the rear a/c blower problems.

Jul 10, 2011 | 2003 GMC Yukon XL

1 Answer

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Have your air compressor for your air tested. Sounds like its bad.

Aug 26, 2009 | 2003 GMC Yukon XL

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Blower fan on a/c quit blowing in front but still blows and blows cold air in back

first off make sure you have no blown fuse. but front blower motor may be bad. if it does not work in any speedyou can check for power at the wires going to the blower. under dash on passenger side

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1 Answer

2003 Yukon xl --front & rear air has stopped working. The fan works fine. We're on vacation. Is there a quick remedy to get it cooling to make it home (6 hr drive)? Thinking it may be best to have it...

if the fans are working , it seams like the compressor is not turning on, check the low pressure switch on the acomulator, at the passenger side in the engine compartment, try wiggling the connector , that switch is very common to fail in the GMs that year, another thing find an auto-part or walmart close to you and bay one of this bottles of freon with a gauge and check if there is freon in the system , if no just put some untill the compressor come on by it self and you fill the cool air inside the car..hope this help

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2002 yukon xl rear ac does not work

are you sure it was charged to full capacity?

Jun 21, 2009 | 2003 GMC Yukon XL

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