Mercury Mountaineer Problem Report

Mercury Mountaineer Heater Stuck on Hottest Setting Due to Broken Heater Blend Door

(69 reports)

A failed heater blend door or actuator can cause the temperature control for the HVAC system to stop working. A clicking sound from the dash area would commonly indicate an actuator fault. If the heater gets stuck on the hottest setting, the heater blend door may be broken requiring replacement of the heater box to repair the issue.

first there was a clicking sound, then the heat was stuck on the hottest setting. have called around town and its looking like $340 plus to fix. This is a very common problem with Fords. If the company knows this, they should fix it for free or discount a repair at the dealership. why keep making cars that are gonna have the same problem. -
heater blend door not working. found broken vacuum line between firewall and engine. Repaired with plastic tape now works fine. -
Its actually stuck on cold with a click sound -
Blender door open on cold side. Not good timing in winter. -
Mine was stuck on heat-no AC-bought aftermarket blend door online-after taking dash out found orig OK, but actuator motor broken.bought one at a national parts place, it wouldn't work, took to shop they replace w/ford actuator-now works, but knob to regulate air flow does not work, will cost another $600 to repair-don't have the $$ to do so -
Just purchased from local ford dealership, two days later clicking sound in heater.. took into service dept and was told not to worry about it... now two days later I have no heat.. taking in tomorrow to see what they will do for me -
Blender door broke - no heat in front of vehicle -
clicking when changing to heat, as far as I can tell the blend door actuator gear must have some stripped out teeth on it. The actuater being replaced should fix the problem. -
No Heat in side Mountaineer. -
My heater started making a loud noise and then it finally went out. I replaced the blend door actuator several times but they kept going out. Everytime I put the actuator in the only thing that will works is my heater. So if I unplug the blend door actuator my air conditioning works. If I plug the blend door actuator in the heater works and my air conditional won't. So in order for me to have air I have to unplug my blend door actuator every summer and in order for me to have heat I have to plug my blend door actuator back in everyone winter which means I have to buy a new one every winter. It's so frustrating don't nobody know what's going on or how the fix the problem please help me!!!!!! -
blend door thumps and has troble changing from warm too cold.not fixed dealer told me it will cost a thousands dollars to fix it. -
No air flow from heater through defrost, floor or dash vents. -
turn on ac its hot then I put on maxac and it gets cold. -
passenger side temperature control not working. do not know if pneumatic, electric or mechanical problem -
Air conditioning blows hot air. -
No heat or cool air. I must keep the dial on the coolest setting or I will get a click click click click noise until I turn it back to the coolest setting. -
replaced blend door, however no heat. -
I have a clicking sound from my dash. Sounds like a blinker was left one. First I heard a big thunk and then it sounded like a vent on the inside of dask was flapping back and forth. Finally it settled to this blinker noise...but no heat. AFter that turned on defrost and big thunk again and got heat. Then big thunk no heat. They tell me it is the blower motor.....ggggrrhhhh -
same as stated on this site! -
Loud clicking noise coming from heater. Gets loud to soft to no noise at all while adjusting the heater control knob. -
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