HAVE NO HEAT AT ALL

  • Tiny
  • Anonymous
  • 2003 Mercury Mountaineer
  • 120,000 miles

Have no heat at all

Monday, January 7th, 2013 AT 2:07 PM

1 Answer

  • Tiny
  • Wrenchtech
  • Expert
  • 19,584 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.

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Monday, January 7th, 2013 AT 2:12 PM

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