help with 89 overflow tank leak -
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Unread 04-27-2005, 10:28 AM   #1
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help with 89 overflow tank leak

I have a 89 cherokee with the plastic overflow tank. About had to buy a new one becouse the original had a small leak around the hose neck so i bought a new one at car quest. Well the new tank leaks from the side and the cap area. So i bought a new cap and it still leake?? any ideas on what it can be?? The jeep runs fine and cool

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Unread 04-27-2005, 10:36 AM   #2
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It's a poor design, to start with IMO. I also have an '89 , but I think this issue is one most of has been victim to one way or another. Mine leaks from the cap on the "pressure tank". When I bought it from my buddy, he mentioned that he had replaced the tank several times, from it splitting wide open. You might want to have a look at, look under "technical" then click "engine" and "budget cooling upgrade (Closed to Open)". I'm seriously thinking about performing this on mine.

Have you burped the cooling system? Ie. gotten all the air out of it, because the air will expand alot farther than the coolant at raised temps. thus forcing coolant out where ever it can find a path.
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Unread 04-27-2005, 10:51 AM   #3
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^^^What he said^^^
Somebody should come up with an aftermarket metal tank reservoir.
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Unread 04-27-2005, 11:08 AM   #4
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they have metal tanks i forget who sells trhem tho. what i did when mine leaked at the hose bung is i cut it smooth and added a fitting to it and it worked. as far as the cracking, jb weld is your friend lol.
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Unread 04-27-2005, 12:16 PM   #5
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My 88 XJ would also leak out of the plastic overflow. I found that if I didn't tighten the cap AS hard that it would leak a lot less or not at all. I think by over-tightening, the cap lost it's ability to release built up pressure. Just a thought, but give it a try it before replacing the bottle!
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