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tips for replacing passenger side temperature mixing servo motor

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I had code 1810 and passenger side vents(both centre and side one) blow cold air while I want warm air.

so I bought the servo motor from dealer and replaced it today. It took me about 3 hours since I did not have a proper tool for the Torx screws. you need a low profile ratchet wrench.

couple of things I thought it might be helpful in the future for other people since it seems to be a common problem and I did not see very clear information online:

  • the servo motor comes in the "service position" mentioned in the manual already. there is no need to adjust it.
  • there is no "service positon" for the flap since it is just a simple mechanical flap with a spring that holds it back
  • if you really want to adjust the servo motor position, according to the service manual, and I tried it myself, just hook up a 12V DC power supply (*do NOT use car battery, the current will kill the motor) to the leads(which shows in the picture, the bottom 2, not the 3 ones goes to the blue positioning thingy). reverse the power supply will reverse the rotation. do not over turn the servo motor since it has a range.
  • I did not see any metal contact surface in the motor for positioning signal, not like some older models, so I suppose it is not "serviceable" by rubbing clean the contact surfact.
  • I did not remove the retaining plate as manual stated but I did removed the heat exchanger bottom cover, glove box and all that.

Hope that helps.

I will replace the defroster flap servo next week. thats on the left side, I guess will be tougher.


Edited by royxaxa
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  • 4 years later...

Do you mind stating the process to changing this part? Our 04 CTT is blowing cold air only from the passenger side while the driver side works as intended. I think it's one of the servo's on the passenger side that has gone bad. Also do you have a part number? 

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