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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Tip:

The number of driven wheels<br> You may not know this, but the average 4x4 is really only two wheel drive. Jack one rear wheel and one front wheel off the ground, and you will note that the wheels in the air are the ones to spin, not the ones on the ground. Even if your 4x4 has a rear limited slip differential, the same scenario applies. So, what can be done to help in this situation? Well, this is the reason a lot of four wheel drivers fit diff locks. A diff lock fitted to just the rear diff, means that if you have three wheels in the air, the one rear wheel on the ground is enough to continue forward motion. The wheel in the air will spin at exactly the same rate as the one on the ground.