Electrical airconditioner compresser

[dom14]

It could be sand that is the problem too. It gets into every nook and cranny.

Yeah, but when mud dries up, it turns into a fine sand like bulldust.

What I would do if I'm you is to replace the compressor with a good quality used one(with warranty) or a new one if you can find a one under $500. Re-gassing should be cheap if you fit the AC compressor yourself with new O rings. O rings only cost few peanuts.
Since you've already lost the refrigerant from the leak, it should not be much of a problem.

Used compressor should be around $100-200.
I reckon you can also try using a one from VL or Skyline and modify the mounting bracket.

http://www.ebay.com.au/itm/AIR-CON-A...sAAOSwal5YFD6k

http://www.ebay.com/itm/AC-Compressor-DKS16H-9260054N00-9034045010-for-Nissan-Patrol-Y60-TD42-TB42-RB30-/152436721755?hash=item237defc85b:gh8AAOSwfVpYq97e&vxp=mtr