NT Diesel Radiators

[Little Devil]

Have recently reconditioned my 3.2 Diesel, replaced radiator, replaced thermostat, fitted new Fan Clutch, flushed hoses and replaced the dodgy hoses as required.
Tow a caravan with a tow weight of about 1700kg, as soon as it sees a hill the water temp rises very quickly and hovers between 103 and 115 degrees Celcius.
I feel this is much to high.
Has anyone fitted and alternative radiator such as a aluminium core/bodied unit with any success?
Than you in advance for any thoughts you may have.

[erad]

The first thing t o check is the viscous coupling. There are pretty of threads on this subject. Bin

[Little Devil]

Fan Clutch

Sorry all, forgot to mention that is new also.

[nj swb]

Tow a caravan with a tow weight of about 1700kg, as soon as it sees a hill the water temp rises very quickly and hovers between 103 and 115 degrees Celcius.
I feel this is much to high.

When you're towing, do you use sport mode and manually select gears, or let the transmission sort it all for you? Do you monitor your transmission temps?

Elevated coolant temps are inevitable under load, but I agree that the numbers you're reporting seem a little high. Your auto transmission cooling system runs fluid through the bottom radiator tank - if your transmission is working really hard, your radiator may not be able to cope with the additional heat from the torque converter.

If your problem is caused by transmission temps, there are a few options available to help control these. If transmission isn't the problem, then you need to look at different solutions.

[Peterng]

I find that copper core radiators are a better proposition when travelling on the road, in general they can be repaired quicker, cheaper and practically by mechanics than an aluminium core radiator which is a bit more specialised.
A couple of mates in my 4wd club went with a aluminium core radiator and have not a real problem with them, but one noted that it runs a fraction hotter.
In regards to your vehicles engine running hot, have you done a through engine oil flush for this could help. The oil in your motor is also a coolant as well as a lubricant and when the oil galley ways get a bit clogged this can effect the flow of oil through the engine components and an engine can run hotter.

[grpcbr]

Water pump?

Evening. When you say “reconditioned”, was that engine internals etc? Also, the NT is starting to age a little and maybe it’s a sign of the water pump not performing??

Cheers

[Little Devil]

Sport Mode

Yes I drive as a manual, change up at around 3000 and cruise in 4th around 80 - 90 kph.
Sometimes depending on road / weather conditions I have to sit on at least 85kph in 4th to stop the torque convertor jumping between lock and unlock modes.
Transmission has recently been flushed and serviced.

[Little Devil]

?? Water Pump??

Pump was checked when engine done. Was rebored one size up and engine was hot dipped, oil and water galleries double checked.

[Christo72]

Maybe check the thermostat, I’ve found over the years just because something is new doesn’t always mean it works properly !

[erad]

Ditto with the fan coupling. New doesn't necessarily mean that it works. Carefully apply a stick against the fan blades and see if you can easily stop the fan when it is hot. If you can, the coupling is not good.

[Allan2]

Have you got a 'thermal infrared temperature guns' a scan gauge or 'Torgue' on your phone? is the engine reaching the temperature the dash gauge is telling you? Does it smell hot? Check the engine temperature with the thermal gun against the gauge. You could have a resister 10 problem in the dash giving incorrect readings.
Some more ideas, could it be a defective fan clutch there have been reports of new ones not having enough fluid in them, faulty thermostat (unlikely) but worth a check place it in hot water to see if it open correctly at the right temperature. With the engine running being carefully squeeze the lower radiator hose almost closed rev the engine if the hose sucks shut the radiator has insufficient flow through it. When did it start getting hot?
Allan