A few weeks ago I had my A/C turned on. I switched the thermostat knob from cold to hot and it got kind of stuck half way (pointing up) and then I heard something pop and it sprung over to the hot side. Now, whenever the air condonditioning system (not just cold A/C) is turned on above the 3rd dot the knob gets hard to turn and will spring to the heat side. I'm gonna take it in when I get the tranny and radio fixed under warranty but just wondering if anyone else had this problem?