Hello All;
Have a 99 Polo 6N1 1.4 60hp AEX Petrol when I turn on the ac when the car is cold it works for approx 3 minutes then shuts off. It will not turn on again for a couple hours then does the same.
I had it re-gassed and the tech says the pressure is ok.
I removed the wire from the pressure switch and shorted the pins and it essentially behaved the same way.
I tested the contacts on the switch and got a closed on pins 1 and 2 which turns on the compressor but strangely got an open on pins 3 and 4 although when the ac runs the radiator fan does switch to the higher speed.
I measured the voltage on the cable and noted that on pins 3 and 4 its approx 13.2 volts and on 1 and 2 12.6
I am now trying to find a wiring diagram for the ac circuit also a diagram of the fuse box layout , searching the web seem to bring up diagrams of other models so if anyone can provide me with a diagram and any ideas what to check next I would be grateful.