Question about 2003 GMC Yukon XL

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Rear air stopped blowing. Front air works fine. Can i fix this myself. What could be the problem?

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Replace the relays, 3 each located om top of the right rear fender well. Must remove the inside well cover to access. Likely only one of the thre is bad. Buy one and sequentially replace each - check for function after each swapout. Good Luck

Posted on Sep 06, 2008

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  • 359 Answers

I would recommend taking it to a dealer, simply b/c there is most likely a clog in the system going to the rear, trust me, you don't want to go there

Posted on Aug 14, 2008

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I jacked up the front of the vehicle, took the cap off of the reserve tank for the radiator, turned the car on and ran the heat (AC off) for 15 minutes. This is supposed to release any air bubbles in the coolant system and I did see air bubbles emerge as I was watching (this might be normal occurance, I'm far from a mechanical expert). Anyway, this did not immediately solve the problem, still blowing cold air as it sat there idling after 15 minutes. Dejected, I put the cap back on, lowered the vehicle and resigned myself to taking it to a dealer.

But a funny thing happened the next day, the coolant level was a lower (no leaks on the floor) so I filled up, and sure enough, when I started the car and let it warm up a little, hot air started coming out of the heater!!!

As far as my wife knows, I fixed the problem for the price of a bottle of coolant, so I am a hero...but at first I thought it didn't work. Here we are a month later and still blowing warm air and haven't had to replace any more coolant...the internet is a wonderful thing!

Hope this works for you, and I hope I can figure out my rear heater problem as well.

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