I only skimmed the info peeps r throwing out so if i rehash anything thats why.

what weight r u running, what outside temps r u driving in normally, u have an auto, 2wd or 4wd, how r u using ur 4runner ie (camping, rock crawling, etc), r u cing these temps on the hwy, city slow driving, mtn passes, etc

Just want a bit more info to guide my response....

The 4runner I currentlly use 4 camping/hunting/"over-landing"/rock crawling etc is probably one of the heaviest units of this forum when completely load up when I go out for a long period of time, weights over...

electric fans will only lower ur temps 5ish degrees (which is a lot when ur getting hot), I run pusher e/fans in conjunction with the OEM fan