4BD1 running temp

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Originally Posted by jorjatom68

Mine sits on about 65 around town and about 75 in summer at about 135(flat out down hill with a tail wind) That's towing my no5 trailer

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Far too low IMHO. If you fix this, and it is not found to be a gauge problem, you should notice some improvement.

This can be caused by a dodgy thermostat or an old radiator cap. Your engine should run at a standard 85 degrees or hotter. Obviously go a new radiator cap first as the cheapest place to start. Then look at thermostat replacement.

Thermostats only work properly when temperature AND PRESSURE are correct.

Hope this helps. I had a very similar problem on the perentie.

Cheers,
Brian Youy