heat

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Dec 2, 2006 | 04:30 PM

gleety

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Joined: Dec 2006

Posts: 3

gleety is an unknown quantity at this point

heat

1999 blazer zr2. my heat only blows out of the dash vents, even when i switch to defrost, floor etc.
the fan works on all speeds, but it only comes from the dash vents

Dec 2, 2006 | 04:37 PM

Chevy Lover

BF Veteran

Joined: Jun 2006

Posts: 3,429

From: Vancouver. B.C. Canada

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RE: heat

You may have a faulty rotary valve in the A/C control head and the vacuum is not being routed to the mode control actuators.

Dec 3, 2006 | 10:12 PM

chrissy

Joined: Nov 2006

Posts: 10

chrissy is an unknown quantity at this point

RE: heat

mine does the same thing and its a zr2 how do u know it thats what it is

Dec 3, 2006 | 10:48 PM

20Blazer00

Joined: Sep 2005

Posts: 865

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RE: heat

There is a TSB about this:

Transfer case vacuum switch seal leaks fluid into vacuum lines and limits the heater controls functions.

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