1990 Mercedes 300SE Climate Control Problem.?

About 1.5 years ago my AC quit providing cold air. I purchased another compressor from the junkyard and have yet to install. About two years ago, I replaced my blower motor. Two months ago, the blower motor stopped running again. With winter coming, I am trying to get the system working again to provide heat. I went back to the junkyard and have acquired and tried a used fan regulator, a used blower motor and a used climate control system. All are the correct unit for my car. I have tried them in combination etc. I am convinced that all the parts I have are good and the problem lies elsewhere. One strange occurance has happened three times now. With all switches in the off position, after sitting unused for a week, all three were cool mornings, the fan has come on and run on high until I touch any button on the system and then it stops. I cannot make it come back on again. Does anyone have any thoughts on what might be wrong?

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