Dual Climate Problems (HVAC)
Thread Starter
Instructor
Joined: Mar 2006
Posts: 140
Likes: 0
From: Houston TEXAS
Dual Climate Problems (HVAC)
Need some help with my logic
Car is a 1997 A4 w/ dual climate control
The story;
Both sides were blowing hot, so I went and got some freon.
While charging the freon, I stuck my hand in the car to feel passenger vent (closest to the pass door) and the air was blowing cold and getting colder.
I finish the charge, drive around for about 5 - 10 min and while parking back at home, the driver side is ice cold and the pass side is hot as he!!.
I have searched the forum and can't determine the problem. Does it need more freon (I put in a 14 oz can) or is the blower motor control module the culprit? I think the BMCM needs replacement anyway b/c I can't control when it turns on or a what speed the motor operates. (Are these related problems??)
Thanks for you help guys!!!
Car is a 1997 A4 w/ dual climate control
The story;
Both sides were blowing hot, so I went and got some freon.
While charging the freon, I stuck my hand in the car to feel passenger vent (closest to the pass door) and the air was blowing cold and getting colder.
I finish the charge, drive around for about 5 - 10 min and while parking back at home, the driver side is ice cold and the pass side is hot as he!!.
I have searched the forum and can't determine the problem. Does it need more freon (I put in a 14 oz can) or is the blower motor control module the culprit? I think the BMCM needs replacement anyway b/c I can't control when it turns on or a what speed the motor operates. (Are these related problems??)
Thanks for you help guys!!!
Melting Slicks
Joined: Jan 2007
Posts: 3,021
Likes: 133
From: Conejo Valley CA
If I am understanding your post correctly, you have indicated that after the freon charge, one side was super cold and the the other side is hot as hell. I did not do a freon charge, but I had a similar problem once. I took the car to the stealership and they told me it was an actuator door problem. It also cost me $700! Ouch!! It indeed fixed the problem. After that, the next three unrelated repairs, by necessity and courage, did them myself 
Burning Brakes
Joined: Apr 2007
Posts: 966
Likes: 9
From: Phoenix AZ
Sounds like the right actuator is bad. I had a similar issue, except it was the left side that was stuck on hot. I replaced the left actuator and all was good.
Are you showing a few HVAC DIC codes (probably B0446)?
Are you showing a few HVAC DIC codes (probably B0446)?
Thread Starter
Instructor
Joined: Mar 2006
Posts: 140
Likes: 0
From: Houston TEXAS
Now I am really confused (not b/c of you guys, thanks)
I took rcataldo's advice and checked for codes and got these (both historical)
B0361 Left Actuator Feedback Short to GND
B0363 Left Actuator Feedback Open
So I am not currently thoring any codes and the past codes are for the left side.
In any event I have read that the blower control is a PITA to get to, but do-able. What about the left and right actuators?
I took rcataldo's advice and checked for codes and got these (both historical)
B0361 Left Actuator Feedback Short to GND
B0363 Left Actuator Feedback Open
So I am not currently thoring any codes and the past codes are for the left side.
In any event I have read that the blower control is a PITA to get to, but do-able. What about the left and right actuators?
