Question about 2004 Mercury Mountaineer

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How can I fix my no heat problem in my 2004 mountaineer, it blows cold air.is there a switch somewhere?

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More than likely you're going to need to replace thermostat

Posted on Mar 23, 2011

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2 Answers

My 2004 Mercury Mountaineer V8 has warm air coming out, but not hot. I replaced the thermostate last night. It is blowing just not hot.


the air from the blower will be the same temperature as the coolant temperature. If you want it hotter you may have to get a thermostat that opens at a higher temperature or close the air circulation vent so that only cabin air is heated.and not fresh freezing cold air from outside.

Jan 15, 2015 | 2004 Mercury Mountaineer

1 Answer

I have no heat in my 2004 mercury mountaineer and i have lights that do what they want ,,what is going on with this


number of possibilites for no heat.

1. Your engine thermostat is broken and stuck in the on possistion. In the winter months, if its stuck in the open posistion, the vehicle may never get warm enough for the heater to blow hot air (i had this problem once, 13 degrees outside and even tho we had been driving for an hour, not a single bit of warm air... fixed instantly with new thermostat) this is a cheap repair

2. you have a clogged/broken or something has happened to your heater core, it is located in the dash somewhere and hot coolant flows into it. This is not terribly expensive, but labor cost may be a bit high, sometimes there not easy to get to

3. and least likely is that your heater door wont open. Does your a/c still work fine? if yes, if you leave the ac on, and turn it from cold to hot, does it stay exactly same temp or cold? or slightly warmer? if it stays the exact same tempature of cold and you cant tell that anytinh has changed, the door that closes the ac and opens to heater could be stuck/broken, etc. or the cable or electric wire controlling it could be bad..

that concludes 3 reasons you could be without heat, as far as your electrical goes, I would make sure all your fuses are in good, otherwise, who knows, electrical in cars is a whole nother ball game

Nov 01, 2013 | 2002 Mercury Mountaineer

1 Answer

The heater on my 2004 mercury mountaineer does not work. When turning the dial from ac to heat, cold air blows out while a sound like a door opening and shutting is heard.


there is a vacuum ran valve on your heater hoses goin in to your heater core on the fire wall, they tend to get stuck shut n dont open to let hot anti freeze in the heater core, so cold air right, qwik fix is find the valve on heater core inlet and wire tie it open so antifreeze circulates no matter what, this is known on ford explorers. pretty much same truck.

Dec 16, 2010 | 2004 Mercury Mountaineer

1 Answer

2004 mercury mountaineer.heat problem When turning ac knob to heat clicking sound like door opening and closing repeatedly sounds and air blows cold instead of hot.


2004 mercury mountaineer.heat problem
When turning ac knob to heat clicking sound like door opening and closing repeatedly sounds and air blows cold instead of hot.

Sep 13, 2010 | 2004 Mercury Mountaineer

1 Answer

2004 mountaineer when changing from hot to cold in climate control. There is something banging under dash. cannot get to go back to heat.


If I understand your problem, what you actually hear is a "clicking" sound. If I am correct, your unit only blows out cold air. If so, your problem is the "Heating & AC blend door actuator. It is a small plastic box that contains plastic gears. The unit receives an electric signal to change positions, but the broken cogs prevent the unit from operating properly. A quick check to determine if this is your problem, turn the heater on. Adjust the temperature from heat to air. At some point the noise will stop.

Apr 24, 2010 | 2004 Mercury Mountaineer

1 Answer

No heat


The clicking noise is a defective air temp control blend door motor, this is all to common and issue, to repair the defective part the dash must be removed.

Nov 17, 2008 | 2004 Mercury Mountaineer

3 Answers

Heating and cooling


You can't even reach the door without pulling the dash assembly out, then u might as well fix the problem,

Nov 06, 2008 | 1997 Mercury Mountaineer

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