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1990 Buick LeSabre Question: heater



tbshb, Luverne, MN, November 08, 2010, 00:40

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

2 Answers
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  • Answer #1

    November 08, 2010, 01:39

    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.

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  • Answer #2

    Visitor, November 23, 2010, 16:07

    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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