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The heater will blow hot and all at once start blowing cold

Tiny
DODGE1
  • MEMBER
  • 2007 DODGE RAM
  • V8
  • 4WD
  • AUTOMATIC
  • 30,000 MILES
The heater will blow hot and all at once start blowing cold. Then the heat gauge starts to go up and truck tries to overheat.
Wednesday, December 8th, 2010 AT 6:18 PM

2 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hello,

It sounds like you have a blown head gasket which filled the heater core with exhaust gases which makes the heater stop working here are two guides to help us get started.

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

and

https://www.2carpros.com/articles/head-gasket-blown-test

Please run down these guides and report back.
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Wednesday, December 8th, 2010 AT 6:25 PM
Tiny
HLACEFIELD
  • MEMBER
  • 0 POST
I had the same problem and had to replace the blend door actuator.
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Monday, January 7th, 2019 AT 6:53 PM

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