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I have a 1986 300 SDL. When ever I start it up warm air fills the passenger compartment for 8-10 minutes and then it switches to whatever climate control I have chosen. I don't mind the heat in the winter, but in the summer time I prefer AC. Any ideas which relay, or switch is causing this phenomenon? Thanks for your help. :?:
 

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This same behaviour occurs with my 1987 300SDL and it has me baffled. Comments or troubleshooting suggestions anyone can offer will be gratefully received. Best regards. John C.
 

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I would first try replacing the climate control push button unit. I've found those at wrecking yards for not too much. Those have problems with poor solder connections inside on the circuit board, especially those connecting to the pushbutton switches.

If you are an electrical type, here are the electrical diagrams for the climate control system...
http://www.startekinfo.com/StarTek/outside/12253/program/ETM/ACCfrom86.pdf
 
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