Water Pump: Remove timing belt rear protective covers, Remove lower radiator hose from water pump. Remove water pump attaching bolts then the water pump and sealing ring, Clean engine block and water pump sealing surfaces, then apply a 3/32 inch of RTV sealant to sealing surfaces. While RTV sealant is still wet, install water pump. Tighten attaching bolts finger tight. Install lower radiator hose on water pump, then belt rear protective covers. Install timing belt
SOURCE: I'm replacing a timing belt
The only other thing could the the timing belt tensioner if there is any doubt. Here's the timing marks.
SOURCE: 2000 jeep grand cherokee 4.0 liter engine timing belt replacement
If you have the same pulley arrangement that most 4.0 engines have that pulley is an idler not a tensioner. Your power steering pump has a pivot bolt, and a slide under the pump. You adjust belt tension using the pump.
SOURCE: Overheating engine
Check your oil dipstick for coolant, or a mucky substance. Your symptoms sound like a blown head gasket.
SOURCE: Replacement of timing belt for 2004 Hyundai Elantra
Just the belt if that is all you need. I would replace all the other belts as well. The Water pump pully has to come offYou can visual the pump better at that time. The easiest way to get the pully back on and off is to remove the Power steering resevoir and transaxell mount in fron middle. Jack the engine up as high as you can get it. Put a block under the pan when jacking to spread the push force. this will tilt it back and up so the pulley will stay ion the water pump nub. It is a two piece pully.
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