I have an issue with the ACC on my 1985 300TD Wagon. When outside temeratures are 95F+ the ACC will occasionally not engage after start up. No blower, no A/C, no Heat, NADA, ZILCH, dead in the water. I have to restart the car and re-engage the ACC and all works. Cold A/C, strong blower, everything is happy, happy, happy. Any thoughts???

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paul300td