I have a 2010 Scudo 1.6 Multijet with an Air Con Fault.

Sometimes (but very rarely) the compressor clutch engages but just for a few minutes then it stops. this is how it all happened.......

I had the system re-gassed as the air con never worked since I bought the van.
It only lasted a few weeks.
New condenser was fitted - still no good.
New Compressor and pressure switch fitted still no good.

I have been told it may be a faulty relay? any ideas on where it's location? what type it is etc? Or any ideas on what else may be the problem?

Many Thanks in advance.