Brought the car into an AC shop to fill with freon and/or find leaks. They said they filled it but the clutch wouldn't engage (it did when I brought it there). I checked the clutch and I checked the codes and they all seem ok, including the low pressure. I put a little air pressure into the system untill the pressure code didn't say low and checked the signel going to the clutch and it's at about a tenth of a volt. What else can I check or what else could it be.

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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)