Originally Posted by Rollinz

Yes i know that,
The pressure switch is there to shut down the compressor if there is
1. Not enough gas and causes low pressure
2. A blockage causing high pressure

If the switch was just faulty and cutting the compressor out, then bypassing this by either bridging the switch or feedingthe coil on the clutch directly... Then the system will work..
But... In doing this his system over pressurised and blew off from a release valve?? (coach systems dont have this)

Now that all well and good but imo there has to be some sort of blockage to cause over pressure that quick..

This is why i am thinking the pressure switch isnt at fault... Its actually just doing it job...
Or whoever re-gassed his car has put way too much refrigerant in??

My thinking is that if it was just a faulty switch then it "should" of just worked fine when he bypassed this?

Or... Do these vag systems have an electically operated expansion valve that will open from the same control as the clutch?

Some erbaspratcher systems on coaches have these....