Heat

Tiny
BRITTANY1994
  • MEMBER
  • 1995 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 255,700 MILES
I have a 1995 chevy k1500 4x4 I have replaced the hoses flushed the Radiator Put in a new heater core but the heat still won't work
Saturday, February 13th, 2016 AT 8:50 PM

6 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If they are both hot, the heat in that vehicle is controlled by a blend door that regulates heated air flow. It is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.
If they are not both hot, then you have an issue with the heater core or engine temp.
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Sunday, February 14th, 2016 AT 5:06 AM
Tiny
BRITTANY1994
  • MEMBER
  • 3 POSTS
I've replaced the heater core and the blend door and both hoses are hot but it's still not working
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Sunday, February 14th, 2016 AT 4:27 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
If both hoses are hot, it is a blend door issue, plain and simple.
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Sunday, February 14th, 2016 AT 4:34 PM
Tiny
BRITTANY1994
  • MEMBER
  • 3 POSTS
I replaced the blend door and it still blows cold.
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Sunday, February 14th, 2016 AT 4:35 PM
Tiny
BRITTANY1994
  • MEMBER
  • 3 POSTS
I replaced the blend door Actuator
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Sunday, February 14th, 2016 AT 4:36 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,778 POSTS
Sometimes the heater core can get locked with an air bubble, try jacking the truck up in the back as high as you can safely. Here is more information.

http://www.2carpros.com/articles/car-heater-not-working

Please let us know what you find so it can help others
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Monday, March 7th, 2016 AT 10:58 AM

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