switching from defrost to floor or dash heat not working

Asked by Guru295FR Feb 20, 2020 at 11:08 AM about the 2005 Hummer H2 Adventure

Question type: Maintenance & Repair

I can only get heat out of the defrost vents no mater what setting the controller
is on. is this a bad climate control module or something else

1 Answer
157,625

James answered 4 years ago

The system has lost vacuum. Look for a disconnected or broken vacuum hose near the intake manifold or the firewall. Hope that helps! Jim

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