2000 Jeep Cherokee OIL PRESSURE-OVER HEATING

Hi, First Thing To Check is Oil, Fill to Mark. Then Check Coolant Fill Radiator to top And Bottle too, Do this On A cool Engine so You Don't Get Burned. Next Is The Oil Gauge Accurate? To really Find Out, You Need A Mechanical Oil pressure Gauge To Check It. Carefully Remove The Oil Sending Unit And Screw In the Mechanical Gauge In there. Let the car Idle For A half hour. With the Ac off. If The gauge Goes Below 10 Psi When Warm, Then It's Internal An Engine Problem, If the Gauge Reads Above 10 Psi, Then Replace The sending unit. Now For The Ac, Does The coolant Bubble In the bottle?If So, You may Need A Thermostat?How High does The temp Gauge go? If It only Overheats With the ac on, First Check that The coolant Fan Is Turning on with the ac on. If not Then Car Needs to be checked Further To see why. Could be a Fan Motor Or Relay Or Fan module?

Hope This Helps You,
Good Luck
Edward S.