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Heater works but blows out cold when driving

Tiny
MELISA
  • MEMBER
  • MERCURY
I have replaced the heater core with a new one and new vacume lines and new thermastat. When I am sitting still my heater blow's out hot and the thermast goes up to normal and then I start driving it and it blows out cold and the thermast drops to cold. What could be the problem!
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Tuesday, December 26th, 2006 AT 3:35 PM

2 Replies

Tiny
TLA258
  • MEMBER
  • 10 POSTS
Try checking your heater blend door actuator, should be behind glove box see it it moves freely or if its broke
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Friday, January 5th, 2007 AT 11:21 AM
Tiny
TLA258
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  • 10 POSTS
If its the same problem I had it was a cracked head gasket on the out side edge of the # 4 cyl, I replaced gasket and heater works great now
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Thursday, January 18th, 2007 AT 5:59 PM

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