Just picked up my very first Patrol

[4bye4]

in that case, sounds like a loose connection on the Air Con pump
have a look at the wiring, it may be old and just need a clean up on the terminal

if not that, then check behind the dash for loose wiring -
has the radio been changed? maybe didnt put the earth to a good spot

Nissan's are bad for earths - really bad
intermittent faults are usually an earth problem

@Bigcol fixed it for you.
earth.jpg