HEATER WONT WORK

2001 Mercury Mountaineer

Tiny

muttnru

December, 23, 2010 AT 6:01 PM

The air conditioner works all switches work, the the heater will not come on.

FOUND 6253 RELATED QUESTIONS

No Heat

37 ANSWERS
5 IMAGES

3 Answers

Tiny

Wrenchtech

December, 23, 2010 AT 6:19 PM

Do you mean the temp of the air is not hot enough or that the blower is not working?

Tiny

muttnru

December, 23, 2010 AT 6:24 PM

Blower works but it will not get hot. Thermastate is good. All valves are working to heater core. It will not change from air to heat.

Tiny

Wrenchtech

December, 23, 2010 AT 6:30 PM

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 too hot to hold. If they are.

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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