Question about 2001 GMC Safari
The HVAC system uses engine vacuum to open and close the blend doors. Check for a broken vacuum line in the engine compartment. It will exits the firewall left (passenger side) of center and will be a hard plastic line. With age and exposure to engine compartment temperatures they become brittle and break. It can be repaired with a rubber vacuum line that fits snugly over the line to reconnect them.
Posted on Aug 07, 2010
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Posted on Jan 02, 2017
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