1990 Buick LeSabre Q&A

1990 Buick LeSabre Question: heater

hello my heater only blows out the bottom but when i put the ac on it will blow out the bottom vent's and the defrost what do i do? thanks -
Answer 1
Take a look underneath your dash for any disconnected or damaged vacuum hoses. You likely have a vacuum leak that is keeping the vacuum driven motors that turn the doors inside your dash for ventilation control from working. -
Answer 2
Check the three way tee on the firewall. You will find it following the vac hose from the cruise servo check for leaks. -
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