2.8 patrol over heating

I take it then that you have had the flushed radiator out?What about the fan clutch/hub.What items have you replaced?

thanks , yes i have replaced the fan clutch and the fan, i have flushed the radiator out 3 and 4 times with different coolant replaced each time ( pre mix and had to mix)

If you havent had the radiator to a repairer to have the tanks off each end/top you may need to as from what I can work out its the only way to clean out a radiator 100%.Sending our radiator in out of our Falcon next week as on steep long hills it gets hot other wise it runs fine.have been quoted $60 to have both tanks off and core flushed out.

If you havent had the radiator to a repairer to have the tanks off each end/top/bottom you may need to as from what I can work out its the only way to clean out a radiator 100%.Sending our radiator in out of our Falcon next week as on steep long hills it gets hot other wise it runs fine,have been quoted $60 to have both tanks off and core flushed out.

Sell it before the head gasket goes and costs you lots and lots of money.

How many k's on the new donk?
Does the temp only go up with the A/C on?
Rob J

This might sound strange, but have you checked/replaced your air filter ? Over fueling will increase temp quite quickly at speed.
An intercooler/turbo hose could have delaminated inside and is blocking air flow.
Is the AC condenser blocked with mud not allowing airflow?

As it sounds like you have completely replaced the cooling system, it might be worth taking it to a diesel tuner to check for overfueling.

HTH

John D - Disco 200 Tdi

Hi Handy
I own the same model and year as yours and it has only run hot when we were in QLD towing our camper trailer up the Melany Road which is very long and steep.
I have religously changed the coollant as per the manual since new with Nissan inhibitor so the radiator is still clean as a whistle and the engine runs just under half way on the temp guage.
If you have been changing the inhibitor from one brand to another I think you may have caused a build up of scale in the radiator core. A flush will not fix this. The only sure way is to remove the top and bottom tanks so the cores can be individually manually cleaned.
Our problem is the radiator being aluminium with plastic top and bottom tanks is a specialised job best left to the experts.
Have you tried removing the thermostat and testing it in a pot with hot water?
Cheers

Do you have spot lights and or shade cloth in front of your radiator grill?
Are any of the radiator hoses kinked?
I seem to remember in the bottom hose arrangement a piece of pipe sits inside the rubber hose to stop the hose scunching together. possibly when the hoses were removed this bit has not been installed back in the correct position as when you pass 100 kph the hoses might be restricting the movement of the coollant.

Just a maybe!
You might have a faulty temp gauge!!

handyandy,just a thought,is it loosing coolant,does it smell hot or are you just going by the temp gauge,which could mean faulty sender unit and or gauge.Any strange smells when you take off radiator cap?If it is loosing fluid go the cheap option,replace the cap or have the radiator professionally cleaned as what we think is cleaned can actually mean 90% blocked,
good luck Dave

G'day Andy,
this may be a dumb Question but when you brought the new raditor did you fit the fan shroud to it when putting it in.
I have noticed alot of people remove these things so they can access the hoses easier. Fatal mistake the fan clutch gets flogged out in the first high speed run.(espesially aftermarket gear)
So when you do need it i.e high speed and hot day RAM air will not cool the engine and the fan clutch has lost viscosity.

Hope you find the cause
Cheers