Sounds like water is getting into the crankcase. Check the oil to see if it is getting milky white. If so, you either have a blown head gasket or a creaked block. You might try draining and flushing the crankcase and putting a bottle of something like Bars Leak in the radiator. If the leak is small enough this might work. Good Luck.
SOURCE: audible knocking in rear of 1993 jeep grand
Sounds as If You Have A Chipped Tooth On the "RING GEAR" in the Differential (Rear Alex).
Is this Where You Hear The Noise Coming from? If So Remove Diff Cover With One Wheel OFF The Ground Trans In Neutral Rotate Drive Shaft and Look Closely For ANY Abnormal Surface on EACH Tooth of RING GEAR= the Large one And The "PINION GEAR" the Small one. If you find Chip or Rough spot Diff Must Be Rebuilt. Beyond that A Pinion Bearing can Also Make A Knocking Noise But the "GEARS" Will Be a Rhythmic Noise. I Hope this is of Some Help To You Good Luck !!
SOURCE: what type of antifreeze should i put in my 2000
Prestone comes to mind at first but most major brands are the same. Follow directions and mix your antifreeze with water in the ratio the manufacturer recommends. Sometimes straight antifreeze is worse than hardly any. I believe most manufacturers recommend a 50/50 mixture.
SOURCE: I have 2001 Jeep Grand Cherokee Laredo and it is leaking coolant
Front drivers side could be a bad cap, lower hose or the radiator itself. You need to look carefully and find the leak source. Steam travels and isn't a good indication of where the actual leak is coolant will run down and take any path it can to reach the ground. Therefore, you need to follow it back to where it is coming from, then deal with it. Your water pump can also leak and run down the lower hose. there is a small hole in the pump behind the pulley. If you see coolant coming from there the pump needs to be replaced. Sealers will not work on hoses or pump leaks so don't bother using them for that.
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SOURCE: dissapearing antifreeze ,white smoke from tailpipe
if the vehicle is missing, pull the plug wires till you find the missing cylinder. pull the spark plug. it will be clean and most likely will be the head gasket. if no miss, start at the intake gasket. toughest part is the getting at the hose on the back of the upper intake. carefull not to damage the knock snsor.
SOURCE: how do I tune up a jeep grand cherokee laredo?
change the cap rotor plugs and wires maybe even the fuel filter
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4.0 engines have problems with micro-cracking in the cylinder heads that generally appear over 70K miles. If coolant is disappearing then obviously it's going somewhere! Knocking is not good...It's a sign of bearing wear (big expensive job). If the oil pressure is following rpm's that's normal up to a point. If it reads below 15psi at idle likely that's due to bearing wear as well. Where the coolant is going? Possibly into the crankcase..if so it can damage bearings. If coming in there slowly, much of it may be boiling off before you see it. Drain the oil and look carefully at what comes out. If I'm right about even a good part of what I've just said, you may be better off getting a replacement engine.
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