Hi , this is first time posting. I just accuired a 2003 Pontiac Grand Prix from my father in law because he became to old to drive. I went to change the heater a/c switch on the dash from venting to defrost and the switch broke off in my hand. It seems the shaft is locked. I found online a new OEM A/C and Heater dual climate control switch for $250.00. Could someone please tell me how to change it? It looks like the center dash trim has to come out, any suggestons? Thanks for any help someone could give. I hope this is not a reacurring problem.