Cold air from front passenger side ducts and no air from center

[danish]

In MY04 CS when I turn the heat on, it is throwing cold air on passenger side while the drivers side is working fine.  I have tried changing temperature individually for both sides, but no cigar.

i read similar post here but it was more about air condutioner than the heater.

 

I had this problem about a year ago, but it started working again after a few hours.

 

Another issue is that there is no air coming out from front center ducts.  This center duct problem somehow fixed itself for a short period of time in the summer when I was using A/C, but returned again.

 

Any suggestion what could be causing these?

[danish]

Could it be related to Solenoid, change over valve?  Can anyone confirm?

[dpatel710]

Sounds like the servo motors. I eventually had mine fail shut so that I had no ventilation in the car. 

[danish]

Servo motors could have failed for center vents, but the side vents are still working as the air is coming from those vents, but cold on passenger side.

[dpatel710]

Mine presented the same way initially.

 

There is a servo motor that controls the temp mixer flaps on each side, it has probably gone bad on the passenger side. You can remove the glove box and IIRC the mixer flap is the lower servo, outboard (towards the radio). You can grab the flap and move it to see if the temp changes on the passenger side. 

 

See the following link for more info: 

 

[danish]

This is interesting and useful.  Going to order motors.  Thanks!