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2005 GMC Yukon Denali

Question: front ac inop

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Visitor, Lake Elmo, MN, July 08, 2010, 08:38

when starting truck engine light came on steady. dissconnected battery for 5 minutes. reconnected and light went out but now can not get any airflow out of center ducts. a/c works fine in rear. a/c does work in defrost and floor mode. so no heat or a/c out of front center ducts. checked a/c fuses seem fine. pulled out climate control head and pulled out wiring harnesses every looked fine. reinstalled and no change. help me please.

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  • Answer #1

    Pvt-Public July 08, 2010, 11:47
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     Master

    Why did you clear the check engine light without getting what ever code was stored? A common problem with these symptoms is a vacuum leak. The doors in the vent system need vacuum to operate. And the engine light may be because of a loss of vacuum.

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    Visitor, July 09, 2010, 20:49

    that maybe true but ive also heard that sometimes manufacture has ses lights come on at certain milage so you come in and pay out your nose for diagnosis. i took hvac control out to get numbers off it. tapped on the back of it a few times reinstalled it. now it works fine. so far no ses light back on. i guess ill just wait and see if problem returns,

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