TD42 running hot when towing

Gday patrolers Muk here,
Can anyone help with any information regarding my 4.2 td overheating issue only when towing my 3t caravan on a 30° day. Ive put biggest natrad radiator i could fit in, removed spotlights from front of grill, installed large topmount intercooler wich helped alot with exhaust gas temps(dropped about 100°c) installed 3" mandrel bent exhaust pipe, replaced air filter housing with custom built aluminium unit. Im running on 33" tyres, 5speed manual ,roof rack etc etc about 3080kg with full longrange tanks and full fridge. Ive heard that a high flow thermostat and maybe a high flow water pump might solve my problems. Can anyone please help with any advice as i love my patrol and cant find anything i like to replace it. There must be some way of sorting this issue.
Cheers Mark

does your engine clutch fan work properly , ie; it should have some resistance and will only spin about half a revolution when cold . is the plastic air dam underneath the car in tact , this is a crucial part that helps create a low pressure area in the engine bay . the rubber strips that go from the body to the chassis in the front wheel wells also help this purpose . do you have a suspension lift as this can also affect the way the air dam works .

It's a subject that's been done to death across the different forums. What actual temps are you seeing?

Temp exceeding 100°c
Air conditioning cutting out aswell.
It does have 50mm lift but all under guard rubbers are in place etc.

New nissan fan clutch fitted, blades all in good condition.
All under guard rubbers good.
Plastic air dam underneath good condition.
Some of foam strips between aircon condenser and new large radiator missing.

Has it always done this? If not, there might be something you have done to make this change?

What Injector pump do you have? Stock, 11mm or 12mm. Do you know what the timing is set at on the IP? What turbo? What injectors? How old are they? What crack pressures? Has you taken the Patrol to a decent dyno tuner at all? There is so many variables with this issues I haven't even scratched the surface on it. I've been through it all and mine still runs hot. Got to 110c and 115c whilst towing and up hills, along the flat it could be around 80-95c. I just drive it now and accept thats how its going to be and drive to the conditions.

As long as I have made sure every component is working, there nothing more I can do.

I’ve had mine at 115C towing up hill. I only back off if EGTs start to creep past 450C.
I’ve towed our caravan into a head wind running at 100-105 most of the day. Only consequence was that the engine was much smoother afterwards.
Not towing I rarely get as high as 85C.

The temp on mine, towing, with an all up weight of around 5 tonne has never exceeded 105deg.C & that was working really hard on a hot day going up to Barrington Tops. For the past three years we've been in the Top End & in normal use rarely see the temp rise above 91 or 92, often closer to 80. My theory is that it relates to use of the right foot & that whilst TD42's can be be driven fast, their forte is burbling across the rough stuff at low revs with plenty of torque, & that if one accepts they are an old design & doesn't try to drive them like a modern car or a muscle car they wont overheat if well maintained, & kept reasonably close to stock. If it doesn't overheat when not towing I'd guess that pulling the van slower may be the answer, & if not the answer that you want, that perhaps you have chosen the wrong vehicle to pull a 3 tonne van.

No doubt one day mine will overheat & I'll have to eat my words, but so far so good - 2006 model stock except for 3" exhaust & a mild dyno (13psi) for towing. Not unusual to see us hurtling along the road at 80-85 kph. :driving2:

Others may have different thoughts, just saying what works for me.

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Originally Posted by Muk

Temp exceeding 100°c
Air conditioning cutting out aswell.
It does have 50mm lift but all under guard rubbers are in place etc.

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Two reasons for the a/c cutting out. 1. She's low on gas. 2. The condensor is overheating. Make sure the condensor fins are totally clean.

I think the factory TD42s have a cutout temp sensor in the rad specifically designed to cut off the compressor above a certain temp.