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Virtual Wrench
Virtual Wrench, Buick Mechanic
Category: Buick
Satisfied Customers: 14620
Experience:  35 years Master Mechanic
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Cold Air is only coming out of the Defrost in my 2000 Buick

Customer Question

Cold Air is only coming out of the Defrost in my 2000 Buick Park avenue is this the door actuator and how do I fix it?
Submitted: 1 year ago.
Category: Buick
Expert:  Virtual Wrench replied 1 year ago.

Hello, Thats because the system defaults to defrost when the vaccuum supply source is not present at the AC Heater control switch.

You need to look for a vacuum line coming from the engine--thru the firewall--to the control unit. It has a vacuum reservoir that holds vacuum and then sends it to the control. This is a VERY easy repair once you find the hose that is disconnected or broken.

Customer: replied 1 year ago.
I thought all these were electronic in the*****
Expert:  Virtual Wrench replied 1 year ago.

Nope...thats just for the electrical acuators for the contrls inside the AC/Heater case.

Its easire to explain if i can call ya?