Mechanics

CHEVROLET BLAZER HEATER PROBLEM

1999 Chevrolet Blazer • 125,000 miles

The heater switch will not go off vent to defog or heater. Whats the problem?
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Guest
February 1, 2013.



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

Gmtech
Feb 1, 2013.