THE HEATER SWITCH WILL NOT GO OFF VENT TO DEFOG ...

1999 Chevrolet Blazer

Tiny

Anonymous

February, 1, 2013 AT 1:21 PM

The heater switch will not go off vent to defog or heater. Whats the problem?

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1 Answer

Tiny

gmtech

February, 1, 2013 AT 9:08 PM

You can turn it but it won't change. Can you hear a hissing noise in the car on the right side or under the hood. It sounds like you may have a broken vacuum line, They generally break near the intake manifold due to being exposed to heat and they are just plastic

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