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

  • Tiny
  • Anonymous
  • 1999 Chevrolet Blazer
  • 125,000 miles

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

Friday, February 1st, 2013 AT 1:21 PM

1 Answer

  • Tiny
  • gmtech
  • Expert
  • 553 posts

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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Friday, February 1st, 2013 AT 9:08 PM

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