Question about 2003 GMC Yukon XL

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A/C blowing hot air and can't find leak....

I've taken my 2003 Yukon XL into 4 mechanics (including the dealer) because my A/C has been blowing hot air. Each time, they insert dye and cannot find a leak and just recharge and add freon. This has been going on for 3 years. Any ideas of where to check?

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  • model of car May 06, 2009

    They found the leak! It was the evaporator core. Very pricey to fix but it is finally working. Mechanic seems to think that it was leaking for for at least 5 years.

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Its probably inside the dash, either in the coil or the connections

Posted on May 06, 2009

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Jan 21, 2016 | Cars & Trucks

1 Answer

My 2002 Yukon XL A/C blows only hot air?


Is compressor kicking in? Fuses? Blend air door actuator failed or vacuum leak? bad vacuum check valve?

May 07, 2015 | Cars & Trucks

1 Answer

2002 yukon ac blows hot but mechanic can not find any leaks. when we put freon in it lasts a day then its back hot. HELP!!!


he may not have checked the evaporator core which is under the dash. you can take off the black cover in the passengers floorboard. should be two 7mm screws then there is a long thin black piece that unlatches revealing the cabin filter. remove the cabin filter and look for signs of a leak if he put leak dye in it. or look for oily residue.

May 30, 2011 | 2002 GMC Yukon XL

1 Answer

Wet floor on the passanger side in front and behind front seat. took out front seat and nothing. 2003 yukon xl 1500 2 wheel drive


Check your radiator fluid level, if it is low it is a good chance your heater core or the hose to the heater core has a leak. The heater core is a small version of a radiator which has the air from the blower blow across it to force warm air into the cabin of the vehicle. You will need to probe under the passenger's dash to locate the leak.

Nov 16, 2010 | 2003 GMC Yukon XL

2 Answers

The A/C unit is not blowing cold air in the front. The back is blowing cold and we have re-filled the unit. Still is blowing HOT air?


your split manifold located on the firewall that sends and directs the refrigerant from the front and rear depending on your setting on the dash is plugged or the climate control on the dash is not responding and there could be a fuse,relay,broken wire,but there cant be a leak or either side wouldn't cool

Apr 23, 2010 | 2003 GMC Yukon XL

1 Answer

My air blows hot


Got to your auto parts store and get a can of R-134a refrigerant with the filling cable, but make sure it's the version that has the red dye in it. Run your car with the A/C and add the canister to the low pressure side of the A/C hookups. The dye will show you the leak, but it may not be in the engine compartment, it may be at the heat exchanger inside the dash, which is difficult to access.

Jun 25, 2009 | 2003 GMC Yukon XL

1 Answer

Airconditioner only blows a/c in the back not front - the front just blows air - not hot or cold 2003 yukon xl


I'm going to assume that is on both sides of the cab? I'm going to say you have an actuator problem, if it's in fact only blowing cold in the rear, and not in the front. The actuators are prone to problems on the gm product lines. Even more with a weak battery.

Jun 19, 2009 | 2002 GMC Yukon XL

1 Answer

2002 GMC Yukon blows cold air from the front, rear works fine


check you antifreeze level and make sure its full

Jan 26, 2009 | 2002 GMC Yukon XL

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