gu overheating

Mine is a 00 GUas well and one of the things you can do to help is to take the radiator out a reasonably simple job and clean it out as the space between the radiator core and the air con evaporater gets full of rubbish.

Have a '03 4.2 Patrol. I noticed it was warming up towing the van. Had the whole system flushed with Mukowt and new coolant but didn't seem to make much difference. Ended up taking it to a radiator place and they found the radiator 50 percent blocked. Apparently not an unusual occurence for Patrols. Since having the radiator cleared the temp guage doesn't move (although my analogue guage does get to a maximum of 108C) when towing the van (3tonne) up hills with aircon on
Peter

Have radiator thoroughly cleaned by yourself or a radiator place.

OR Buy a new radiator. I got an aftermarket one for $495 (country price including freight) and fitted it myself

We had a similar problem with our TD42 in our Maverick - in our case it was the thermal cuppling in the radiator fan which had slowly deteriatored.
Regards
Steve & Alison
walkabout.tekcities.com/

I tried all sorts of things on mine and in the end I decided that anything up to around 118oC was okay. The trick is to have a proper gauge to monitor the ACTUAL temp, rather than rely upon the Nissan gauge which registers in the "normal" position (just below half way) when the actual water temp is anything between 45oC and 105oC. Once it exceeds 105oC (as registered by the VDO gauge in the top hose), then the Nissan gauge starts to rise in such a way that in the space of 15oC (from 105oC up to 120oC) it goes from the "normal" position to just under the "danger" mark on the hot side.

With that in mind, I disconnected the plug in the bottom of the radiator that senses the temp and "tells" the air conditioner to turn itself off. That meant that the air con stayed on.....and I really don't think that it being on had a great impact on the coolant temperature.

Like the others have said, I would recommend getting the radiator thoroughly flushed and cleaned etc (inside and out), check the viscous hub and either replace or add some extra fluid to it.

I also don't believe having driving lights in front makes much/any difference to the cooling.

The product called Red-Line Water Wetta (grey) might be worth using too. Others have reported good results with it. I used it once too, but the one I got was the red coloured one and from I have since learnt, the grey version is better for diesels.

Good luck.......just remember, the 4.2 is as tough as old boots and doesn't seem to mind running a bit warm all day if necessary.

Cheers

Roachie