Tip & How-To about Cars & Trucks
Blend door actuator failure is a common occurrence on many older Explorers. The clicking noise is actually caused by a stripped nylon gear constantly attempting to hold open the blend door which mixes the hot and cold air sent to registers on dash. As long as the temperature control setting is in the heat range this actuator will hold the door which wants to be normally closed, open. Air flow when the fan is on helps to hold the door open relieving stress on the gear. However whenever the fan or engine are off and the temp control is in the heat range the small gear must hold the door on its own which eventually leads to failure. My tip is to always return the temperature control to the cooling position whenever heat is not needed or truck is turned off. If you are reading this too late the link below will provide you with step by step instructions to replace actuator. I would recommend an OEM replacement part, it makes it easier to orientate when installing the new one. Did this myself and all went well.
Posted by Andrew... on
Nov 23, 2012 | Cars & Trucks
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.
Nov 05, 2012 | Cars & Trucks
Jan 28, 2011 | 2000 Ford Expedition
Dec 04, 2010 | 2003 Ford Explorer
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