Heater/cold air switch stuck

1994 CHEVROLET SILVERADO
200,000 MILES
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ALASKADOC
  • MEMBER
  • 1 POST
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
Mar 12, 2018 at 7:11 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good morning.

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

Roy
Mar 12, 2018 at 8:03 PM
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ALASKADOC
  • MEMBER
  • 1 POST
Yes.
Mar 13, 2018 at 1:16 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 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
Mar 13, 2018 at 1:21 AM
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