just had the ac compressor replaced, system was converted to 134a,
worked fine the day i took it home, just got it back on the road after a ball joint
issue, seems the compressor does not kick in?? is there a relay to check or
where should i look first??
thanks in advance..

 

The low pressure switch will keep the compressor from turning on if too much refridgerant is lost. If that switch died, then the compressor won't turn on. Mine died before I got my AC working...

I've got my own question - this is on the '87 924S. I converted it over to 134 myself (have done this successfully on other cars before); it worked great at first, but now it won't cool. Here's what I've found. It does appear like it may have lost some charge; however it still shows some 134 in there, in that it shows static (engine/compressor off) high and low pressures of 50psi. But when I turn the AC on, the high pressure only goes up to around 100psi, and the low side sucks a vacuum! It also equalizes pressure pretty quickly after turning it off.

I'm thinking there must be a choke point, like maybe the metering orifice is blocked?