heater on 1990 Buick LeSabre

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

by in Luverne, MN on November 07, 2010
2 answers
ANSWER by on November 07, 2010
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 by on November 23, 2010
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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