Hi fellas,

I have the diesel HZJ80 1993 model and yup, she’s a overheating. Was all fine until I started towing my boat (trailer + boat = about 700kg) when after about 80 km/h the temperature would rise and eventually lead to water boiling out of the overflow bottle.

Replaced the thermostat with genuine Toyota, new top and bottom radiator hoses, had the radiator flushed out by a radiator place, replaced the fan clutch and I drained the oil out of the new clutch and put in the Toyota silicone oil, new coolant, new fan belts.

Now its progressed to overheating when I am driving the car alone over 80 km/h without the trailer on.

Any thoughts on what it could be next? No leaking from the water pump but I’m thinking there next ?

Thanks.
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If you're like the majority of 4x4 Drivers, you won't be able to change the diff oil until you get home, because you won't have spare oil and a sump pump to change it. If you suspect contaminated oil (a deep water crossing without extended diff breathers or perhaps you have leaking diff seals) then you can try and remove the water by draining the diff until only oil comes out the drain hole. Do not drain too much and leave your diff short of lubrication. Collect this oil and water emulsion as you should never dispose of oil into the environment. Save it till you get back home and dispose of it properly. Its not only diffs that can have water contamination, but also your gearbox, transfer case and engine oil. However, it is usually only when a vehicle is stationary in deep water that these components are contaminated.