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Heater

(1990 Buick LeSabre)
in Luverne, MN on November 07, 2010
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
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Popular Answer
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.
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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