The clicking/knocking eventually stops sometimes in a minute sometimes in about 5 minutes
SOURCE: clicking sound
Try changing the temperature of the rear a/c if the sound stops, check the rear a/c servo that controls air flow/termperature.
SOURCE: Clicking sound coming from the driver's side rear by the tire
check rear axle on the driver side and check the fluid in the transfer case and also check the brake calipers and there is also a rear pad inside of the router if the pads a bad you will get a clicking noise
SOURCE: Rear A/C and heating unit makes a knocking sound when turned on
I had the same issue on my 04 Expedition. Like the other posting it is most likely the actuator motor that sets on top of the rear AC unit in the back. However it cost me about $35 dollars and about 15 minutes for me to replace. It is easy to access by removing the top cover that is located on the passenger side rear cover found in the very back underneath the rear glass. Also remove the cup holder which can be removed by prying upward until it pops loose.
The actuator is white and located on top near the front of the rear AC unit and is held in place by three screws. Simply remove the screws unplug connection. To reinstall the new one you may have to turn on the rear AC and barely plug in the actuator until is moves to the position so that it lines up with the blend door. When lined up the actuator should fit right back in place. You could also compare the old unit with the new one and make sure the shaft is in the same position so that you know it will fit back into place. If the new unit does not move when you plug it in to align the shaft, simply select floor or roof position (which is the opposite position you are currently in) on the rear AC control. This should activate the actuator and you can see the the shaft slowly move.
This fixed mine. It is a common problem and my local dealership had them on the shelf. More often they see the front AC unit have this problem but does occur on the rear unit.
SOURCE: I have a 2006 Ford Expedition. The Air
you have a vacuum loss to the ac control head, the motors that divert air are vacuum operated, if you loose vacuum the system goes to defrost for safety reasons, the vacuum comes from the engine, then goes o a plastic vacuum tank under the hook start there, it is a 3/16 id hose.
SOURCE: Air Conditioner stops blowing cold air when vehicle is not moving
plus one on the cooling fan problem. if it was low on charge then as you slow down, condensor temps and line prressures would raise therefore it would cool at low speed and and not when moving since the incoming air would drop system temp,reducing line pressure and then cusing compressor to cycle. the auxillary cooling fans must be on whenever a/c is on, if not, thats your problem. get this taken care of because if you get stuck in traffic, your engine will overheat also if fans are not running
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