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Heater/cold air switch stuck

Tiny
ALASKADOC
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • 200,000 MILES
The button that switches the heater on is stuck on "cold air" setting so that is all that comes out is cold air. Can I repair this easily myself? If yes how? If you suggest mechanic should fix, what is the average amount it should cost?
Thanks, Nancy
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Tuesday, March 13th, 2018 AT 2:11 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

When you command cold to heat and back, can you hear the mode door move in the heater case?

Roy
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Tuesday, March 13th, 2018 AT 3:03 AM
Tiny
ALASKADOC
  • MEMBER
  • 1 POST
Yes.
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Tuesday, March 13th, 2018 AT 8:16 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, so the mode door is working. We need to look at the cooling system.

Open the hood and go to the firewall where the two heater hoses from the cooling system go to the heater core. With the engine at normal operating temperature, are the hoses both hot to the touch?

Roy
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Tuesday, March 13th, 2018 AT 8:21 AM

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