I'll park my car and then come back to it later and turn it on and the AC isn't working even though it says its on 60 or whatever it is set to...The guys at the Acura dealership said to tap the dash and it will come on and I have and it works. What I want to know is, what is causing this? AC compressor? How much $$$ are we talking here? Should I let it keep on doing this and just live with having to tap the dash or...??? Thanks.