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 Reply

Tiny
GMTECH
  • EXPERT
  • 552 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

Was this
answer
helpful?
Yes
No
Friday, February 1st, 2013 AT 9:08 PM

Please login or register to post a reply.

Related Heater Switch Questions