Mine heats up under load too. Is this a turbodiesel or NA? Could be headgasket. How is your heater output?
I agree clogged rad is likely cause. If you are still in Seattle, stop by and we can take a look at it together... I am around. Shoot me a PM if you want a phone number.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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