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I always have to/want to gear down going up hills. Even long slight hills the temps go up... On highways that are 100km/h, I'll drop it to 4th, and on proper hills, down to third, the less the motor is laboring the lower the temps...
I just drive it like a truck and not a Suzuki Escudo up Pikes peak...
I have a standard radiator with a high flow water pump. And onces im over the peak, on level ground, the temps recover very fast to normality.
My temps are usually 77-80 pending ambient temps and whetehr the AC is on or not... But up a hill, I've seen them as high as 90C. Thats the highest ive ever had on my car I reckon. If I didnt gear down and lugged it up a hill in 4th or even 5th on highway, they wold go much higher I imagine.
I dont know whats safe MAX. But I just go with the "less is better" attitude.
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