I am trying to repair A/C. I have 134 in it (1995). Weird, as I am getting a VERY high suction pressure of 92 and a low (high side) of approx. 90 ! also!I tried to send 12v to wire going to compressor clutch (with a lead from battery + to wire but nada, zip. I thought that 12v would override the pressure switch and kick in the compressor clutch and therefore compressor..Any ideas? anyone now a good site for info re A/C troubleshooting? Thanks everyone, ! REally appreciate the help! Been looking for a MMax for a while now, wanted diesel, but the few I found (after 20+ yrs looking!! were rusted out and or 4500+!!! and still "rough", IMHO!! After reading most of this site!! in the last few days, I'm not sure whether to turbo this gas engine or just bite the bullet and go turbo with the upgraded engine 4d56...diesel..