Question about 2005 Mercury Mountaineer
Blows cold air when set on heat and makes click noise
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 &
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
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
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
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
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
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
Tips for a great answer:
Temperature Control Blend Door Failure No Heat or no AC (dependes on
where door sticks)
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.
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