tommyjack Posted July 7, 2004 Report Share Posted July 7, 2004 I've lost my cruise and A/C blows through the defrost and heater. Is this a bad vacumm check valve on the vacumm canister? If so how do I check it to make sure. Also no codes. Working on a 92 STS 4.9. Thanks Link to comment Share on other sites More sharing options...
careldo Posted July 7, 2004 Report Share Posted July 7, 2004 not sure about the check valve but i would check all vacuum lines for cracks and or unplugged lines first. Link to comment Share on other sites More sharing options...
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