Hi have 1988 300SE W126. The a/c is cold and works fine but the compressor disengages after a few miles and won't come back on until I turn off the car and restart it. Again in a few miles (if I'm lucky) it is off again. After reading several posts about all the reasons the compressor will disengage, I tried a few but it keeps happening. I then thought I would wire in a temporary switch between terminals 15 and 87 at the relay connector and leave the compressor relay out. Turning the switch on made the compressor start, but it still quit after a few miles. Now I can't get it to come on at all. There seems to be at least 5 wires going into the terminal on the compressor. Does anyone know if I can bypass everything and supply 12volts to the compressor energizing coil to engage it? I live in Phoenix at 105 degrees. I would really like to just force it on when I need it. Thanks!!