Ok just bought my vette. When I am moving the AC is ice cold. When I stop the driver side gets warm and the passenger side stays cold. I have looked and looked and cant find this issue in the threads. Anyone have any ideas?

 

Sounds like you may be a bit low on Freon.

 

I will check if that is it. Thanks.

 

I am seeing the same thing with mine. The passenger side is cold but the driver side air stays warm. Post up if you have any luck fixing yours.

 

That happens sometimes when the freon gets low. So check the freon level and get a full charge. If that is not the issue then you might need to re-calibrate your actuator doors.

 

Same problem Low freon. Just had 1lb added today, all is well.

 

These systems are sealed systems. They do not leak Freon if there is not a problem. You might want to put some dye in with the Freon for your recharge. They will be leaking again soon (probably bad O-rings somewhere) and it may make the system easier to diagnose.

 

Do you have air flow on the passenger side? If not check vacuum system for leaks. If you have air flow through the right ducts go to freon discussion.

 

I am going to check the freon tomorrow if I have some free time. Hopefully that's all it is. Wasn't that hot today and it didn't get as warm when I came to a stop.

 

In my case, the driver side was warm while driving but relatively cold at idle. The passenger side was always cooler than the driver side. Adding some freon fixed it for me. This happened after I had my compressor replaced.

 

Thanks I added a pound of freon and it seems to have corrected the problem.

 

It was the freon. Needed .5lb seems good now. Thank god suppose to be 93 today and 95 tomorrow.

Thanks All

 

I am currently battling the same problem with my 2000. The passenger's side is significantly colder than the driver's side. (like 20 degrees F. or more) There are no HVAC codes at all. I did the F27 fuse reset with no change. Suspecting a defective left temp valve actuator, I pulled it out, opened it up and checked the gears carefully. No problem here. Reinstalled the actuator and verified it's movement when drivers temp **** is turned. Pulled it back off, and manually moved the temp valve to full cold position. Still the big temp difference remains.

I have searched the archives of this site for an answer, and came across several posts where people say that a low R134A charge can cause this. What I can not understand is how that could happen when both sides are being supplied cold air from the same evaporator core. If it "makes enough cold" for her side, it "makes enough cold" for my side as well. The temp valves for both sides are located right above the heater core and evaporator core. The only logical answer is that the drivers side temp valve is mixing some hot air with the cold air for the driver's side. And yet, members have added R134A to their cars experiencing the same symptoms, and cured the problem. I'm baffled and befuddled.

Does anyone have a cut-away view of the HVAC system with dual controls that shows the path that the air takes in the different modes? I have an exploded view of the parts, but it makes it really difficult to determine the exact path taken.

Also, does anyone have the "System Performance Test" from the factory shop manual? That is the only way to properly test if an a/c system is performing as the manufacturer designed it.

 

Mine was 1.5 lbs low on Freon. Ice cold ever since I put that in on both sides idling or moving. Hope you get it worked out.