Mechanics

HEATER

Chevrolet Blazer

1999 Chevrolet Blazer. 4.3 Engine 85270 miles: My Heater will not blow onto floor. It will switch to defrost or Panel {face} only. You can switch it to floor but it comes out up top. Any suggestions. : (
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GLEN133
February 6, 2007.




Sounds like it may have a broken control lever that operates the vent flap (valve) to allow air to move. It's in the heater box, in the dash.
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Get a flashlight and take a look under the dash. It may just be a vacuum hose that disconnected that opens that duct.

Tiny
Ffas23
Feb 7, 2007.

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