1995 Jeep Grand Cherokee Laredo V6 Four Wheel Drive Overheats when the A/C is on?

I have a 1995 Jeep Grand Cherokee Laredo, V6, with Four Wheel Drive. If I have the a/c on, the vehicle tends to overheat. What could cause this? I just had a new water pump put in 2 weeks ago, replaced an upper radiator hose (that helped some) but when I turn the A/C and I'm sitting in traffic it just tends to go past the 210 mark, and I have to roll down the windows and turn the heat on.

Could it be the raditor cap? Should I just replace the radiator cap and see what happens, or should I go as far as replacing the thermostat and seeing what happens?

Or since a Radiator cap is cheap, should I buy both and just see what happens. Are there other things that could cause this besides the things I mentioned above?

Please help...
I've talked to a few friends of mine who are mechanics and they said it could be the thermosat, and that was 3 of them, and that's all that they mentioned...

Thanks in advance,

serious answers only.

thanks
 
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