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Driver's Side AC blows warm, psngr side cools fine

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
Posts: 1
Joined: Sat May 28, 2011 8:40 pm
Year and Model: 2006 S80
Location: Texas

Driver's Side AC blows warm, psngr side cools fine

Postby LovemyS80 » Sat May 28, 2011 8:48 pm

Driver's Side AC blows warm air, passenger side is still cooling fine. Fan is not affected. Would love to know how to fix this. Seems to be involving a valve that is just not opening on the driver's side of the dual climate control system. Anybody have any ideas on what the fix is here?

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Joined: Fri Nov 12, 2010 4:25 pm
Year and Model: 2004 V70R GT, et al
Location: Ponder Texas

Re: Driver's Side AC blows warm, psngr side cools fine

Postby jimmy57 » Sun May 29, 2011 12:25 am

My suspicion is low refrigerant as this is common on P2 Volvos to have the driver's side warm up if the refrigerant is low.
Quicke check for low charge is to run engine at a high idle (1200-1500 rpm) for a few minutes. I have a mailer tube I put on accel pedal and run the power seat forward to hold my throttle. A wooden dowel or old broom handle cut to the proper length also works. After a few minutes find the larger a/c pipe that comes out of center of firewall. It should be cold. If not it is low on refrigerant.
If the line is icy cold then check for the servos that move the doors in climte system to regulate temp not functioning right.
Turn the driver's side temp to to full hot till knob stops , wait a couple of minutes and then turn it to full cold. Do this with engine running and fan on in middle position. Listen and feel for air temp changes and for the sound to change, repeat for the passenger side.
The 2005 and up volvos damper control system can get confused and full travel commanded through full hot to full cold end points may reset it.
If you can't get resolution then it is time to go to a shop that has VIDA or other scan tool that can do COMPLETE vehicle.

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