Quote:
Originally Posted by mtbtim
My cooling system is sound. Fan clutch, radiator, and thermostat have all been replaced. I do plan on re-gearing to 4:88 which I know will help. I’m wondering what else I might be able to do. I’ve heard the Champion radiator might allow me to run cooler. If you have any suggestions, I’d appreciate reading them.
Thanks!
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I'd still suspect the cooling system just a bit - the radiator cap. If not new and OEM, change it out.
I had slight overheating issues when I had a weak radiator cap - it got up in the 210*F range in ~105*F heat with a medium load (32's, armor, 3 dudes w/ backpacking gear) on long hills. It was always fine around town, in traffic or on regular freeways (rock solid at 191*F). After replacing the cap, no issues with the same or higher load in harsher conditions. I already had a new radiator, new water pump, new thermostat and coolant (all OEM).
The OEM cooling system is incredibly good, I think it might be as simple as the radiator cap.
-Charlie
Edit: PS. I always run about 40% coolant / 60% water - it has been ok down to as low as -10*F temps on my Subaru, and I'd assume the 4Runner would be fine that way too.
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