Question about 2005 Mercury Mountaineer

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How do I change the blend door actuator on 2005 mountaineer

Blows cold air when set on heat and makes click noise

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1 Answer

Get under the dash & remove the 3 screws
holding the Vent Blend Door Motors on

Have about 5 of them

They are on the Motorcraft Web Site, with a diagram &
part numbers

You buy them from Amazon (Motorcraft OE Part)

If you use a scan tool in enhanced mode & look at the
HVAC Module, you will see the code & know which one
has failed

Need to try every manual setting & use your diagram,
to also see which location doesn't switch air flow

Posted on Nov 15, 2014


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Posted on Jan 02, 2017

  • 10319 Answers

SOURCE: 2004 mercury mountaineer.heat problem When turning

Most likely the blend door actuator has a stripped gear on it causing the noise you hear. Since it runs repeatedly the stop on the gear has sheared off making it run like this

Posted on Sep 26, 2010

  • 2299 Answers

SOURCE: 2004 Mercury mountaineer will not

This could be a couple of different problems. The first and most common problem is that the control motor that moves the door inside the duct work for the heater has failed. The door on the heater core is no longer opening supplying to supply heat. The other problem that it could be is that your climate control module that has the digital thermostat is not sending the signal to the motor in the duct work to open the heater core door. And finally the last thing that it can be, which is not real likely on a 2002 is that the heater core is plugged and not letting hot water from the engine though it.

Posted on Oct 28, 2010

  • 1 Answer

SOURCE: 2004 mercury mountaineer.heat problem When turning

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.

Posted on Nov 11, 2010

  • 6 Answers

SOURCE: will only blow hot air

Did you check for the vacuum line connections? They are vital to the servo motors that open the internal doors in the climate control box. Many times they get either disconnected by the fire wall or they get cracks, or burnt against something hot, thus creating the loss of vacuum power to the servo motors or actuators as you call them. That would be my starting point. Being that issue resolved also check the amount of Freon gas you have in the system from your low pressure side, the charging port should be close to the accumulator or drier. You have to connect a gauge to it, a gauge designed for the AC system, with out it, you cannot determine if the system needs some charging. Some times you can actually get a "kit" from the auto part store that already includes the gauge with the Freon bottle, but you wold be investing in Freon without knowing if you actually need it. The reading with the engine at idle and the AC working at MAX should read between 35 to 50 psi according to the environment temperature. ie: at 70 degrees it should read about 40 psi. at 80 degrees about 45 psi and at 90 degrees at 50 psi. That being the maximum reading, never higher than 50 psi. But before getting to this point I would resolve the blend door actuator issue as you call it.

Posted on Aug 28, 2011

  • 10319 Answers

SOURCE: Working on 2000 mercury grand

mode control switch in the ac heater control unit on the dash

Posted on Sep 18, 2011

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Related Questions:

1 Answer

The heater kicks on but only blows cold air

Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Jan 03, 2013 | Cars & Trucks

1 Answer

We own a 2005 Kia Sedona that has worked well for a long time. However, recently the heating has stopped working and blows cold air.

Yes the fix is to remove the dash from the car and replace the blend door and the blend door actuator.

Nov 06, 2012 | 2005 Kia Sedona

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Driver side blowing hot air passenger side blowing cold air

I'm having the same problem except on mine it's the driver's side that's blowing cold. Do you have the pictures in a finer resolution? I can't make them out and when I zoom, they are too grainy. Does the replacement require removing the dashboard? What's the general cost of the acuators? Are they readily available at like NAPA or other parts stores?

Nov 26, 2011 | 2006 Kia Amanti

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Air/Blend Door Actuator Modual is defective: See info below
Description : Temperature Actuator Attributes : Controls the blend of hot & cold air Make : Ford Brand : Dorman - OE Solutions
Application Notes:
Please select Detailed Applications
for Application Note information. 604-203-007.jpg

Mar 14, 2011 | 2005 Ford Five Hundred

2 Answers

Heater blows cold air

If the Temp. Selector Control is set to Heat and blows cold air, your Blend Door Actuator may be stuck or it is inoperative. The actuator is not fixable, if it fails, it must be replaced. Follow the instructions to remove and replace it.
  1. Disconnect battery negative cable from battery and properly isolate to prevent accidental reconnection.
  2. Remove the instrument panel.
  3. Disconnect the electrical connector from the blend door motor/actuator.
  4. Remove the four screws holding the blend door actuator to the plenum.
  5. Remove the temperature blend door actuator.


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Oct 07, 2010 | 2003 Mercury Grand Marquis

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

2 Answers

2003 mercury grand marquis LS heater does notr blow hot air, blower blows but cold air comes what is the problem

The blend door is stuck in cold position. That usually happens because the blend door actuator has failed.

You will need to test and replace the blend door actuator.

To replace the actuator you will need to take apart the dash and remove completely the instrument panel,d isconnect the connector, remove the four screws, remove the temperature blend door actuator and replace it.

The replacement is not a job for beginners, since you have to take apart the dash to access the actuator.


Nov 18, 2009 | Mercury Grand Marquis Cars & Trucks

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

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