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12-02-2006, 04:30 PM

gleety

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Join Date: Dec 2006

Posts: 3

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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

12-02-2006, 04:37 PM

Chevy Lover

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Join Date: Jun 2006

Location: Vancouver. B.C. Canada

Posts: 3,429

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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.

12-03-2006, 10:12 PM

chrissy

Join Date: Nov 2006

Posts: 10

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RE: heat

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

12-03-2006, 10:48 PM

20Blazer00

Join Date: Sep 2005

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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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