fluid for fan

Davoe,
From what I can gather it's a bit hit and miss as to whether it works or not.
On my GU, I bought a new genuine fan hub (over $300-; ouch) and fitted it myself. I've kept the old one and pulled it apart and cleaned it. If/when the "new" one stuffs up, I'll try using 3 vials of toyota fluid (that's what I've read is best) in the old one and re-fit it.
Funny thing was that when I separated the 2 halves, the large rubber "O" ring was way to big to fit back in the slot designed to house it. I didn't stretch it in any way, so don't know why it was that way. I'll have to buy a new one if/when i do the repair job. I cut a bit out of it (about an inch), so that it now the right length and might try to join it back together with either a heat source or some super glue...not sure about that, but you can bet that a new "O" ring will be big $$$$$$$

Good luck.

Yep I tried it on my GQ, it has seemed to make a huge difference, but is hard to say until we get a bit more hot weather. But at least now the fan actualy works when you first start the motor up, something it wasn't doing before. it was an easy enough job on the Nissan, and the O-ring was more like a rubber gasket and didnt stretch at all. I will try to find a link that I was given and get back to you if you want to still give it a try. Clutch oil is available from Toyota for $9-$10 a tube

Added fluid to mine(from my local Toyota dealer) and bent the bi-metallic spring a bit too- it was then however running ALL the time and ran very cool even towing a 2 tonne van up the very steep hill to Maleny (and same up to Toowoomba).
After a bit of trial and error, I removed just enough of the fluid so that it would cut out after running a minute or so after start up, now it's better than new.
My 14 year old TD42 runs cool AND the fan only cuts in when necessary now.
I'm happy and did not have to fork out for a new hub- guess it depends on whether or not you have the time to muck about or would rather spend the dough on a new hub.
One thing I know however, is that a lot of people spend a lot of money on other things when it's the fan at fault.
If you don't hear it ROAR at revs when the engine is getting hotter than normal THEN IT IS NOT WORKING!
Hope this helps, Cheers

some good replies guys my 2h motor runs about 1/2 around town and between 3/4 and maximum on the highway (doesnt boil when I pull up) I checked nearly everything (radiator, thermostat, fluid flow) 4 years ago and came up with zip so I buried my head in the sand and put it down to the fact it is a 2h motor in a hzj vehicle and may have had a dodgy sender/gauge but after reading these and other posts I think the fan would be worth investigation

DAVOE,
Had the same problem with my 80 series. After trying just about everything- radiator flush, new thermostat etc, i had it finally fixed darwin ( on my way round the top from perth)with the toyota fluid.
To the best of my knowledge there is no grub screw to get into the fan clutch so we tapped a hole in it, put the fluid in, then put a grub screw in.
Worked a treat.
Biggest problem before was obviously the overheating- especialy pulling up hills.
Once the temp gauge goes over half, i believe the toyotas have some type of cut out switch that then shuts the air con down, made things a little sticky for a while.

This was two years ago and i havent had any problems on any of the long trips ive done since.