Question about GMC Yukon XL
Heater core is eather stoped up or not working correctly, Check by using a clothes hanger and shove it up your a/c drain tube. This should be located on passenger side up by the firewall, Sometimes this gets stoped up. But more then sure it's the heator core. Best of luck to you.
Posted on Apr 04, 2011
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Posted on Jan 02, 2017
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