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HDGENE, ASE Certified Technician
Category: Buick
Satisfied Customers: 5632
Experience:  Master Auto Technician
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NO air through vents. Air mode = default thru defroster or

Customer Question

NO air through vents . Air mode = default thru defroster or defroster/floor outlets in Bilevel mode 1993 Buick Lesabre custom. Vacuum line from engine to firewall = ok. Suspect vacuum control to air mode door since operation sporadic (95% default Occasional flow through vents until a shrp turn or bump. How to access vacuum control? Behind glove box??
JA: How long has this been an issue? How many miles are on the car?
Customer: Sporadic over last 2 years.. Mileage ==156k
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: diy =aok Have removed engine compartment cover to inspect vac line up to firewall
Submitted: 1 year ago.
Category: Buick
Expert:  HDGENE replied 1 year ago.

Hello, you would need to remove the climate control panel on the center of the dash and verify you have engine vacuum to the control panel when it defaults to the defrost position. If not you need to follow it back to the firewall and make sure the vacuum supply is intact. If you have vacuum to the control panel the the control panel would need to be replaced.

Expert:  HDGENE replied 1 year ago.

Do you need more help with this concern?