Hi guys my first post since being roverless around 4 months back
. I struggled a lot with this issue with my cars. My first Autobio fans wouldn't come on and the thing for no reason at all would randomly overheat ! I had never heard or saw the fans working.
But once I changed the fuse box I heard them working a few times and let me tell you its loud. On my third and bestest 38 yet same thing but no over heating even though rad was corroded and clutch fan was limp 8) would only start to crawl into the red zone if left standing or crawling in traffic for a loooooong time and even then would not cross over into the red and stay with in the end of the normal range.
Just jumper the three fan relays to see if they are working and the wiring from the box til the fan is correct. This will work even with the engine off. One for series and one for full on for each of the fans.
On all my rovers though I took out the dual pressure switch under the left headlight. Totally unplugging it from the A/C bottle ( dryer ?? ) and jumped the switch ( Black and blue wire I thinks its been more than a year since I did this last so cant be really sure). So everytime I switched on the AC and the compressor kicked in the ground circuit would complete and the fans would come on in series. This was basically to get extra ice cold air from the A/C as it gets pretty hot here and stays that way !
People here have put in switches to manually turn on the fans from the inside if you do a search.
Cheers guy. Hoping to get a P38 one day again soon. Due to the crisis there have been some really nice ones being sold aswell as dirt cheap, but still not in the position to get a 2nd car
Until then I will be lurking around here. Still learning and maybe give back something from my Range rover days