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Ford
Explorer Sport Trac
40

Heater Stuck on Hottest Setting Due to Broken Heater Blend Door on Ford Explorer Sport Trac

Problem Description and Possible Solution

A failed heater blend door or actuator can cause the temperature control for the HVAC system to stop working. A clicking sound from the dash area would commonly indicate an actuator fault. If the heater gets stuck on the hottest setting, the heater blend door may be broken requiring replacement of the heater box to repair the issue.

Problem Data
RepairPal Verified
Average mileage: 97,520 (42,000–200,000)
8 model years affected: 2002, 2003, 2004, 2005, more2007, 2008, 2009, 2010
40 people reported this problem
Comments
Viewing 1 - 19 of 19 comments
After running for a few minutes the passenger side switches to heat and will not go back to cool. If I turn off the engine it may work again.
I had a problem with the heater box blend door also. I also had a clicking sound . There is a small servo that moves it back and forth the gear was stripped I pulled one at the junk yard and replaced it. I actually only changed the gear itself.
same clicking sound and stuck on cold air . need to know how to remove dash assembly to access heater blend box.
Moving the temperature selector creates a clicking sound, down by driver's foot well behind access panel, when moved to a warmer temp. The sound goes away when selector is all the way to the coldest position.
Blend door makes clicking sound when turning knob to heat.

Nothing yet as I still have heat/cool air, defrost capabilities. I am very careful with turning the knobs.
Vehicle wasn't warming the cabin... warped heating box/flap.
Cost me $475.00 to replace... mainly labor because of how time consuming it was to reach/remove warped part.
clicking sound started then before I had time to investigate the position 1 and 2 on the HVAC controls do not work anymore.