Eric Experience replied:

Crawf
The total heat load should be ok, something to consider is where does the hot air get away? The fan has to work harder if the hot air is restricted, one way to determine this is to place spacers under the bonnet hinges so that the bonnet is raised about 50mm at the back.If this solves the problem consider louver's in the inner panels.
Eric.

Eric Experience replied:

Crawf.
If your experiment shows an air flow problem, you can cut the louver's with a side grinder and then shape them with a hammer and dolly. Eric.

fishaholic replied:

still wondering about the moving of the intercooler any ideas pros cons etc???

Mr Pointyhead replied:

I run a Safari Turbo and intercooler on a 2003 1HZ 105 series. I do not get any overheating problems at all with it, infact the engine runs slightly cooler now.

Do you have a EGT (Exhaust Gas Tempretiure) guage on yout engine to monitor what the turbo is doing ?. It is possible that the installer of the turbo has set it up with to much boost, resulting in too high a EGT when under load. This could be the cause of the overheating. However, this could also result in premature failure of the engine. If this is the cause you need to get it checked ASAP.

Other get the normal causes of overheating checked.

- Is the Radiator fan coupling working ok ?

- Is the Radiator not blocked (Internally anbd externally) ?

- Is the coolent ok ?

etc.

IMHO, there is something wrong with your engine/cooling system at the moment that is the root cause of your problem. You need to find out what that is before any more damage is done to the engine.

Member - DOZER replied:

Gday
i agree with others, it is not your intercooler causing the problems, the first thing to do is check the gauge...is it really getting that hot....a probe on the outlet back to the rad will give you the result. When your under there, the fan should be making alot of noise and sucking aur through...if it isnt, and its hot, change the fan viscous coupling...they loose their oill....I would also suggest you get your radiator checked for mud and if you havnt changed the theristat, do so.
The other things that can be contributing is too much fuel,too much boost restricted exhaust muffler or late injection timing...diesels usually run cool, i have 4 rads infront of my radiator (full width intercooler, power steer cooler, auto tranny cooler and air conditioning) and not a problem with heat.
Andrew

domlc100 replied:

Hi fishaholic
I have had fitted to 03 100 series a dts turbo with a under bonnet intercooler, mine doesn't run hot at all just came back from holidays with my camper on the back and it runs cooler then before it was fitted. They filled a Nissan patrol scoop on and colour coded to the car and it looks better on the Toyota then the Nissan. I had the choice to go front mount but the extra plumbing to go to the front of the car and back again put me off so I am happy I went for the under bonnet one.

Member - DOZER replied:

Gday again
Make sure the head has an earth strap to the body somewhere...that helps the gauge read right. If you are loosing coolant out into the bottle, or it isnt sucking it back in, you have compression leaking into the system. co does not usually show up in a diesels radiator even if it is leaking., but the loss is a sure sign.
lastly, it is very uncommon, but water pumps plastic fans have been known to spin on shaft.
See, if it isnt the cooler, and the motor is not running out off spec, it must be the flow between the two....thermistat must be kept in these motors as they recirc the water when closed, if it has been removed, this will also cause overheat.