ok as i wrote on fwor's forum (check it out to see if i miss somthing here)  I am the proud sucker of a 2000 grand cherokee laredo w/ 101,000 miles. the wife loved it so we upgraded from a 98' xj and daddy overpaid.  so now that you all see how dumb i've been now i  can tell you how competant i am. A few weeks back while doing some routine fluid checks i noticed low coolant. Now, this bothered me because a few weeks prior to that i replaced the water pump and had been checking now and again for signs of leaks or what ever. Anyway after some snooping i found a residue on the oil filler cap, lo and behold, i needed a head gasket. now here we are new gasket little more compression, i should be happy, no. only days after the car was returned to me i was checking things again and, low coolant, residue all back again.this along with higher oil pressure and a stiffer throttle.the throttle was not so stiff when i first got it back but when the symptoms came it began. The mechanic who did the head tested it and assured me the head and gasket were fine. I trust him because i know he's competant and he's a friend of mine.I know he didnt screw me because i stopped in a few times and saw the vehicle in different stages of the repair even joining in at one point( No thats not the problem!).So what to do?what is going on? This may give some of you something better to think about than tire direction and i hope soeone is experienced or smart enough to help me out. Any suggestions, answers, or even blind feedback would be great. thanks guys

           I would, if you havn't, run the pressure test on it again. I know on the 5.2 & 5.9 V8s that the exhaust manifold bolts run into the water jacket, and have to have a sealer put on them when installed. If you don't, the coolant runs out and burns up in the exhaust. Mopar has pulled this stunt on a lot of there heads. I do know on my 4.2, the head bolts run in to the blocks water jacket also, and I would bet the 4.0 is the same way. If these where not coated with a sealer, or the seal didn't take, that can cause coolant loss. You could try some of the stop leak products on the market. If it is the threads of a bolt causing it, it should stop it. If it does, Flush it and refill after. You don't want any more of that stuff in there than you need. Its worth a shot, for the 5 or 10 bucks it would cost.  But I'll bet ya, if he said your head and deck are OK, thats what you will find. Its always the 3 dollar parts that causes the most problems.   

doesn't leave much but a cracked block does it?  

wow, master engineers come up with this stuff?  

      No. Its the bean counters.  

        Talking with a friend of mine. He's been a wrench at one of the Jeep dealers here in town for about 20 some odd years. He mentioned the point that the intake could be warpped, and drawing the coolant though the engine. What ever it can't burn, blows by the rings. Whats left, if its a bigger leak, he said you may smell it in the exhaust, as it boils off it the catalytic conv.   

Water being sucked in by the warped intakemanifold would explain the low coolant, but if water was being sucked into the cylinders it would cause a few more problims though, water unlike air doesn't like to be compresed.  If I was you, I'd go get a bottle of dye-pen and check your clinder head for cracks.  Just because you have good cylinder pressure it doesn't mean you don't have any cracks.  

thanks for all the input guys, these thing's will be checked tomorrow.  

          Coolant won't compress, and thats how it blows past the rings. If it is leaking there, it would be a very fine mist, a few thousand times a minute. On a computer controled engine, it can comp. and seem to run fine, with a slow leak. Just like the old school water injection. Any more than that and the cylinder goes dead and won't fire. Just looking at all the options I can think of.  

i didn't think a warped head sounded right since i didn't overheat the engine at all, so tomorrow my guys gonna dye test it, his buddy from a jeep dealer, checked it out, 85% its a cracked head. Thanks for your input bud, dont be afraid to get back at me