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This is a discussion on Newbie Question within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hey guys, new to the forum... '05 WRX with 4EAT. Radiator leak at one of the tanks, so I am ...

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    Newbie Question

    Hey guys, new to the forum... '05 WRX with 4EAT. Radiator leak at one of the tanks, so I am replacing the radiator. I was thinking of going ahead and putting in the Mishimoto Aluminum upgrade, but I see they recommend an separate transmission cooler kit with the replacement radiator when used with an automatic transmission. Is that necessary in a non-track/race application daily driver that is still basically stock? Does the standard oem radiator have hooks into the tranny system?

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    Registered User SubasaurusWRX's Avatar
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    Yeah, most vehicles have transmission coolers in the factory/ OE style radiators when it's equipped with an auto trans. Even under street use, the trans gets hot.


    If the engineers determined it needs a cooler, it would be very unwise to omit one when you go replacing the radiator, I certainly wouldn't risk destroying a transmission, those can get pricey lol.

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    lit fam XJman's Avatar
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    Heat kills transmissions.

    Sent from my Nexus 6 using Tapatalk

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    Quote Originally Posted by JDDearrington View Post
    Hey guys, new to the forum... '05 WRX with 4EAT. Radiator leak at one of the tanks, so I am replacing the radiator. I was thinking of going ahead and putting in the Mishimoto Aluminum upgrade, but I see they recommend an separate transmission cooler kit with the replacement radiator when used with an automatic transmission. Is that necessary in a non-track/race application daily driver that is still basically stock? Does the standard oem radiator have hooks into the tranny system?
    Thanks for considering our aluminum radiator JD! As noted by others within this thread, installing a transmission cooler is a wise move. The factory radiator features an in-tank heat exchanger for the transmission cooler. Our aluminum radiator does not have this in-tank unit, so an external cooler is recommended for those with automatic models.

    Quote Originally Posted by SubasaurusWRX View Post
    Yeah, most vehicles have transmission coolers in the factory/ OE style radiators when it's equipped with an auto trans. Even under street use, the trans gets hot.

    If the engineers determined it needs a cooler, it would be very unwise to omit one when you go replacing the radiator, I certainly wouldn't risk destroying a transmission, those can get pricey lol.
    Agreed!

    -John

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