Question about 1988 Jeep Cherokee

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88 Jeep Cherokee Transmission Fluid Leak

I have a 1988 Jeep Cherokee with a problem. It likes to leak transmission fluid. The other day I blew out a transmission cooling line. Replaced it, and even though everything appeared smug and no leaking, as soon as I started driving the Jeep it started leaking, almost gushing out of the Radiator, which on my Jeep was also the Transmission Cooler. I started the process of installing a brand new out of the box Transmission Oil Cooler. I followed the instructions perfectly, and still was having a leak. Everything again was leak free until I started it up and added transmission fluid. Where am I going wrong? I spent over 12 hours and about 150 bucks in parts/tools for the conversion. It is an 1988 XJ with the 4.0L I6 and AT. Any help would be greatly appreciated.

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  • paganpunk Apr 19, 2009

    I am using 5/16" transmission cooler hose. As for clamps just using the clamps that you have to screw down, the name of them are slipping me right now. Right now it appears to be leaking from the fittings that go to the new transmission cooler. I have tightened them as tight as I could by hand, didn't have a wrench handy. The only thing I could think of was that the fittings weren't going 100 percent into the hose, but then again they wouldn't fully fit in there. It isn't splitting the hose that I could see and it wasn't blowing off the connections.

  • paganpunk Apr 19, 2009

    Yeah I think one of my problems was that I was getting the hose clamps on as tight as possible, I will be working on it again tomorrow and try that Would it also be helpful if i double clamp the hose ends that go onto the actually metal lines that run to the transmission?

  • Roberta Smith
    Roberta Smith May 11, 2010

    what type of hose are you using... what type of clamps are you attaching the hoses with.... and what type of leak... is the hose splitting.... blowing off the connections.... ??


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You need to tighten those fittings with a wrench... if they still leak... remove them and wrap them with a couple turns of "teflon tape" the kind they use for plumbing. the clamps you should use are hose clamps of the same type that you use for radiator hoses... you will note these can be tightened with a socket.... you really don't need to over tighten them but fairly snug... transmission fluid has quite alot of pressure.

Posted on Apr 19, 2009

  • Roberta Smith
    Roberta Smith Apr 19, 2009

    if it's not leaking from there you need not bother.... if you do it tho... make sure that the part that is tightened... is not in the same spot as the other clamp.. in other words stagger them abit...

    Please take a moment to rate this solution as well.... thanks


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