rear HVAC is posessed...

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T3rry

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Anybody else had this problem? my read HVAC is posessed, it just does whatever it wants, about 50% of the time it'll work fine, the other 50% it'll just go crazy, we have it in the off position 90% of the time, and all the suddon the fan will just start blowing full power for like 3 seconds, then half, then full, then off, then full, just goes crazy fluctuating.



when i bought the truck the rear fan was disconnected, i assume this is why the previous owner disconnected it.
 

vatahoelt

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my guess is the rear hvac control module located above the mirror.
 

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