If I put a dedicated cooler in it, it will be in front of the radiator so the engine fan will pull air through it at all times. I tow a lot but not too heavy.Īdding a cooler with a fan is nice but really only necessary if you are doing low speed things or if you are mounting the cooler in a remote place where there won't be a lot of air moving over the cooler. Until then I will drain and fill the fluid every 50K for good measure. I asked the dealer if they would install it for me and they said no, putting in an aftermarket cooler voids your warranty. I actually bought a separate cooler cuz I was worried about my trans at one time but still have not installed it due to the warranty. But maybe I'm dumb and trust Toyota TOO much. This ready-to-install kit includes 5 of durable rubber hose, a. Mishimoto universal fluid coolers are applicable for use with transmission fluid, engine oil, power steering fluid, and a variety of other automotive fluids. The Toyota engineers know what they are doing and if it needed it I believe it would have come with it. This cooler features a highly efficient 15' x 7.5' x 0.75' tube-and-fin core that promotes dramatic temperature drops. The 4 used to come with dedicated trans coolers (4th gen) but Toyota either eliminated this due to budget concerns or found it doesn't really need it. It is believed that if you tow a lot or heavy loads that you need a separate, dedicated trans cooler. This is not as effective as a dedicated trans cooler because the trans fluid is also getting heat from the radiator fluid. The trans fluid is routed into a separate circuit of the radiator. The 4Runner has a "sort of" trans cooler like every vehicle does.
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