Ihave a 1969 camaro built in august of 1968. I can not get the heater to work. I have checked the heater motor and it works fine. I have installed a new wiring harness and heater switch. I do not know if this car had air conditioning originally. The switch has 2 plugs one ontop of the other. The top plug has no juice to it, but the bottom plug has juice to the grey wire. The fuseis good and there is juice at the fuse. Please Help George