Just for comparison sake.....On my '87 SDL (different engine), the aux fan comes on at 105C. I could never get it to come on for the AC, although I believe that you have the operation correct. And if you take the pressure switch off the rec./dryer, you will lose freon.
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Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback
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