I'm having a problem with the a/c on my '03 Suburban... I'll be driving down the road with the a/c blowing just fine, when, all of a sudden, heat will start coming out of the driver's side.(I have the analog dual controls.) My only fix has been to pull over, turn off the truck, then turn it back on. This works for 5 min...sometimes 5 hours. Anyone know a solution? It's very annoying--especially when it's 100° outside. EDIT--forgot to add... I've also tries disconnecting the neg. terminal for a few hours to "clear things out" with no luck.