Overheating 98 jeep grand chero kee laredo have

There is a good chance the head gasket is leaking.
If the air flow thru the radiator is good, and the coolant flow is good, there could be something like an exhaust restriction that is causing extra heat, or the head gasket may be leaking.
Will it get hot just sitting still, or do you have to be driving it ?

the water pump may be faulty or the radiator could be blocked.....cheers.

Yes a bad water pump will definitely cause it to run hot. you'll probably be able to hear it as well as a whinning noise from the front of the engine. Also check for really low or incorrect fluid. jeeps are know for bad water pumps and leaky radiators. the heater pump is a seperate pump from the water pump. Also check for radiator fan opperation while the vehicle is stopped. If the fan is not coming on, it could be a fuse, relay, or intake air temp sensor.

Sounds like you installed either a bad t-stat or something foreign like a piece of gasket or some gasket sealer is stuck in the t-stat itself, causing the t-stat to stick open

id try new plugs wires rotar and cap first

Try these troubleshooting tips before replacing anything else.

If you put the thermostat in correctly (spring towards the engine) that should be OK. Likely if the water pump wasn't leaking or had a bad bearing, you wasted your $ on that.
If you re-filled it and did not have the heater on high heat, you may have some trapped air in there. But, still overheating says another thing. If you have a blown head gasket, it can pump compression into the cooling system and drive the coolant from the core. It will also overheat. You can have that tested at most any decent shop that will do a hydrocarbon test to find that.I think someone makes a chemical test kit for that but not sure if it's very expensive or not. White smoke from tailpipe will also be an indicator as will be any coolant in the engine oil or coolant on one or more spark plugs. If it turns out that it has a head gasket problem don't stop looking for problems as often a faulty fan or obstructed radiator can cause the initial overheat that caused the gasket to fail.

Sounds like an electrical problem; look for loose, corroded or kinked/broken wires. The problem is most likely in the dash wiring/connections and seems to be pretty common in jeeps.

did try replacing the water pump? quick trick get a soda bottle with the mouth big enough to fit and seal in the radiator filler neck fill botle with water set it in place in the radiator neck upside down start engine and look for air bubbles streaming up the water in the sodar bottle if bubbles are present then you have a blown head gasket causing you to over heat

Does the vehicle crank for extended period of time upon first starting? If so the fuel pump needs replacing.