I had the same problem. Inside the dash there was a broken gear that kept slipping to change over to heat or AC. What I did was turn the heat on full blast for awhile and youll hear a loud pop and the clicking will stop
Usually a sign of a faulty blend door motor or actuator.
SOURCE: 1997 F150 heater problem
your problem is caused by the air temperature control blend door actuator motor being defective, the little motor moves the door that gives either hot air or cold air or a blend of the 2.
SOURCE: need to remove the heater switch on 2005 ford explorer, how ?
You need to replace the temp control actuator. It gear is stripped in it.
SOURCE: 2004 explorer clicking under dash
this noise is the air temperature control blend door motor, a very common problem and very hard to repair, he dash must be removed to access the motor..
SOURCE: when you turn on the heater makes a clicking noise
It's the "blend door actuator." Ford part # 19E616. It's a part that basically blends cool and hot air together to provide the desired climate. There's a cheapo little part of it with plastic gears that strip-out and then you get this clicking sound as though the heat is trying to work.
The part costs ~$70...install might run you around 2 hours...so I'd have to guess it's about a $200 or so fix.
I had this part repaired just over a year ago, and now it's failed again. Nothing but endless problems with the Explorer I bought brand new...actually wouldn't start a few days after I bought it and dealer couldn't figure out what was wrong...neither could 4 other dealers. No more Ford for me...ever!
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