Heater is not changing from defrost to bi level

Asked by hairman Jan 15, 2014 at 03:57 PM about the 1993 Buick LeSabre Custom Sedan FWD

Question type: Maintenance & Repair

I have a 1993 Buick laSabre. The heater will be on defog or defrost. When I push the button to change the air flow to heater for bi level the air will not blow out the dash vents even though the light on the heater module says it on bi level or heater.

JHAR2 answered 10 years ago

CHECK THE SMALL VACUUM HOSE THAT RUNS FROM THE ENGINE TO VACUUM BOX ON THE FIREWALL ABOVE THE BLOWER MOTOR.

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Heater is not changing from defrost to bi level

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