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So both my 2013 Volts had heat issues early on and both had the K10 unit replaced. But the earlier build Volt began giving me issues last winter but seemed to correct itself. However, now it appears heat issues returned.

The Tech at the dealer found that I never had an HVAC program update which I thought I had asked for when the K10 unit was replaced. So now I have heat but it costed $125 for the programming. I don't see a bulletin on the bill but I posted below the info that was there.

REPROGRAMMED THE HVAC CONTROL MODULE WITH UPDATES CALIBRATION. CODE 9978A

I think this only affects Volts with a build date prior to 3/2013.
 
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