tips for replacing passenger side temperature mixing servo motor

[royxaxa]

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 October 19, 2012 by royxaxa

[andrewjt19]

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?