When I switch from defrost vent to dash vent it stays blowing through the defrost. Any thoughts?

Asked by Jan 29, 2016 at 05:35 PM about the 2004 Chevrolet Tahoe LS

Question type: Maintenance & Repair

1 Answer

74,185

The climate control system has lost vacuum. When this happens it defaults to defrost for safety reasons. Look for a disconnected or broken vacuum hose going from the top of the engine through the firewall and into the passenger's compartment. HTH. -Jim

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