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Keep blowing out HVAC units

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  • Keep blowing out HVAC units

    I have an 06 g6 base v6 and it keeps blowing out the HVAC unit (it has the manual knob style). I just put the 3rd one in last week and it did it again. Everything works as it should for a day or 2 and then no lights will come on and the only thing at all that works is the blower speed knob. The blower motor works as well but nothing else. No temperature adjust, No A.C., no actuator door changes, no rear defrost etc. Nothing lights up at all. This is the same exact thing that happened the last 2 times I changed it so all I can even fathom is a bad BCM? Anyone have any thoughts.
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