I have a 2001 GTP with dual slider air/heat controls. I took a road trip today, and noticed that with the A/C on, sometimes the drivers side would blow cold, then go warm, then go cold again. The passenger side is always cold. It seems intermittent, and I can sometimes fix it by wiggling the drivers side slider. To me, this sounds like a blend door issue.
Then, on the way home (about 3 hours), I didn't put the A/C on because it had cooled down. I left the sliders on cold and kept the vent on. I had no strange swings in temperature like I did with A/C on. It would stay cold the whole time, and I could adjust the sliders and it would behave as I'd expect. Now, it doesn't seem like a blend door issue.
Could this be an HVAC control unit problem? Any other ideas?
