Heater won't blow out hot air

Tiny
BECKYCOLLINS
  • MEMBER
  • 1997 MERCURY MOUNTAINEER
  • 80,000 MILES
I turned the heater on one morning and was working fine. The next day I turned it on and it was blowing cold air. I have replaced the thermostat and still won't blow out hot air. Fan works fine. A hose was also replaced due to wear on hose. Still won't work. I can't figure out what is wrong, could it be the core in some way and how would I know that is the problem
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Thursday, October 10th, 2013 AT 10:30 AM

2 Replies

Tiny
JDL
  • EXPERT
Do the heater hoses get hot? Does the engine reach normal operating temp? Another possibility is an actuator under the dash.
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Thursday, October 10th, 2013 AT 11:01 AM
Tiny
JDL
  • EXPERT
Just to add, if both heater hoses are hot, I don't think it is the heater core. You could flush the heater core if you wanted?
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Thursday, October 10th, 2013 AT 11:05 AM

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