I have a 2001 F150... A/C was working great but soon would only work on high setting and I figured it was simply the switch. This week the high setting became weaker till it finally quit. If I switched from "max ac" to "ac" or "panel" it would work. Well, now it has gone from working to only working when I press on the accelerator. When I stop at a light or anywhere else....no cool. Same senerio for heat. I replaced the switch this morning. I can hear it go from heat to cool, I can hear it switch from defrost to the panel but still no air. If this was a resistor issue, would it still work on high? At a loss here.......