It was shortly after I put it back on the road, on the early ones there is a water pipe near the passenger side injector fuel line, it had a pin hole after sitting under a tarp for close to 4yrs so I took it off and cut part of the pipe & put some hose over it or lengthened the hose that was there, really awkward as there is a bend in it, goes down to the thermostat from memory, anyhow still leaked so took it off again and re-did everything and it still leaked so took it off again and took all the pipes off including the cross over pipe made sure everything was sweet and put it all back but found I'd left one of the cross over bolts out and remembered I only finger tightened the other but figured it wasn't going anywhere so left it like that not knowing for some STUPID reason the bolts were also a water seal as you said so it came off for the 4th time and has been sweet ever since re tightening etc but from memory you have to take half the front of the motor off to replace that thermostat pipe so that's why I did the patch up job, would have been easier to do that in the long run.
I had a similar problem with my knock sensor on the Liberty, had that out about 4 times in a row trying to fix the wire as the plug had snapped, about 2 hours the first time & about 20min the last tome including the intercooler lol.
Make sure you re-route that inlet heater pipe and don't just block it, makes the car overheat otherwise as my ex wife's friend found out on a cheapie I got her lol.