Question about 1999 GMC Sonoma
It is probally in the heater box behind the dash. It is controlled by vacuum line
Posted on Sep 26, 2009
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Posted on Jan 02, 2017
The thing to do is check for vacuum leaks. In the engine bay look for any "hoses" coming from the firewall. These are for the heater contols. If any of these are broke? Replace them . Have you installed a after market radio? Sometimes heater controlls get messed up. I would take the radio out and examine the heater controlls.
Posted on Jan 10, 2011
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