I have a 1999 jeep grand cherokee limited it over heats when i pull a pop up camper, the motor runs at the temp of 200 degrees and the electric fan runs when i put a hot wire to it and it will not run with out it , i have changed the thermastat and the heat sencer, what else can i do

Those motors run HOT. if your not losing any coolant and your system has a fairly recent i.e. in the last two years been flushed I wouldnt worry about it.

Check the fan operation to the radiator. If the secondary fan doesn't come on it can't dissipate the heat generated from the condensor. There are relays that control the fan under the hood in the electrical center. Check power and ground to both fans when vehicle running A/C on, both fans should be running. Check for blockage in front of rad / condensor.

This is a common problem with WJ Grand Cherokees, it's called a "Blend Door".

In the heating and cooling system you have doors that open and close to give you warm and cold air and a mix of both.

What you have is an arm that pulls a door with peg on top, the peg tends to snap off. As you said your dealer replaced the blend door or doors I would take it back as is has blend door all over it.

Yahoo and youtube "jeep grand cherokee blend door repair"

I had a 02 limited blend doors issues (note the issueS) and was lucky to have it still covered.

I do hope this helped.

have you checked that the rad is clear and air can flow through it freely,,,is it blocked up so the water cant flow through it freely ,is the fan realy working or sezed up so it cant turn round??
if all this is ok, they changing the temp censor or for a test run,,,short the fan temp censor plug out with a bit of whire this should start the fan up,,,(watch your fingers when doint this) go for a run to see if the motor stayes cool

"normal" varies by a few degrees dependent upon ambient temp. In general anything from 200 to 210(f) is fairly normal.

Check your radiator for external and internal obstructions (leaves, bugs etc on the a/c condenser or leaves between the condenser and radiator, rust or calcium deposits inside the radiator core all cause loss of heat transfer)
Also make sure that the system is full and that the electric fan and the clutch fan are operating properly. (electric fan should come on just above normal operating temp and clutch fan should not be "freewheeling" above temp either)
Note: If you need to have the radiator flushed, do it separately from the engine. especially the inline 6 and 4 engines rust up inside and if the system is flushed with the radiator connected, the debris will pack up inside it and actually can worsen the condition.

If you have verified that the dash temp gauge is correct by checking temp of coolant in radiator,yes your guess would be what i would change,the engine needs to have a 195degree thermostat in it.195 degrees is what the computer is programed to see as normal running temp.

200 degrees, cooling fan comes on around 222 degrees

never heard of this before ,i have worked on quite a few jeeps here in spain but never had this before .power steering yes ,radiators yes ,funny american electrics big time ,does yours have the manual fan and a back up electric fan or is it all electric fans .Quick tip ----if it starts to run hot ,put the heater on screen and blower on full this will keep the engine cool ,if no heats comes out of heater then stop because you have no water in the rad

Your thermostat is stuck closed. It needs to be changed right away. By the way the operating temp on that motor is 160 degrees so you are running hot you have just been lucky so far. Good Luck