Tip & How-To about Cars & Trucks

Ford Explorer clicking- no heat

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.


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04 odyssey blows hot air all the time. Even when system is off. Set on 60 just as hot as 90.

Blow hot air all the time,well the blend door system have been changed begining in 2001 they use a blend door actuator besides as making a constant clicking noise as they fail the internal gear moves and does nothing,lots of failure with these new type of actuator, all new cars now use it from 2002 on up.

Nov 23, 2012 | Cars & Trucks

2 Answers


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.

Nov 05, 2012 | Cars & Trucks

1 Answer

Rear AC / heating thumping sound

Yes the noise can be gear "jump" over, the teeth don't break since they are nylon in most cases. This is most often caused by a sticking/warped air temperature control blend door.

Apr 20, 2017 | 2004 Ford Expedition

1 Answer

2003 ford expedition rear ac makes noise when engine running and how to remove the cover of the same

What kind of noise is it? If it is a "clicking" noise, a common problem on the Expy, you will need to replace the Blend Door Actuator. This is a small unit on the passenger side, rear. When you take the panel off, turn the key on to make the noise so you can locate it (there are actually 2 units) they have plastic gears that strip out, making the clicking noise. To remove the panel to access, you'll have to carefully pop the panel off and remove a couple of bolts around the seatbelt.

Jan 28, 2011 | 2000 Ford Expedition

2 Answers

2003 ford explorer no heat and clicking in dash board

Clicking sound is your blend door actuator stripping it's gears and failing to open the door that directs the blower air through the heater core. Follow the sound to the actuator and remove it. Install a new one. You may have to remove some panels to get to it. The part is shown below and costs $32 at autozone. Please let me know if you have questions.


Dec 04, 2010 | 2003 Ford Explorer

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