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Are you sure you have the air conditioning on and not the fan?? sounds very much like it. The airconditioning compressor is discrete, separate from the engine/heater.
Is your coolant reservour fully charged with coolant?
Think you may need to check these
The warning lights are probably not related to no heat, unless the engine is low on coolant. It sounds like a problem with the blend doors under the dash, or the main controller. You may need a shop manual to diagnose it.
Is it boiling over or do you have a bad temp gage. An easy check of the thermostat: When the engine is hot, does the heater put out heated air. If it does, then check the fan if it's electric. If it doesn't, change the thermostat.
Air conditioning is one area where the owner generally is not qualified or equipped to perform the necessary repairs. If you are overheating and the ac isn't cooling I would check the condenser (radiator in front of the engine radiator) and made sure it's not obstructed. Also make sure that the electric fan comes on when you engage the A/C. Beyond that there isn't much you really can do except have an professional run a diagnostics on the system.
The blower fan relay is located in the fuse box on the driver's side fender-well.A Jeep Cherokee uses an electric fan as an auxiliary fan for engine cooling and for cooling the air conditioning condenser when the air conditioning is in operation. A radiator temperature-sensing switch that activates the fan relay at 198 degrees F turns the fan on and controls its operation. The temperature drops when the vehicle is in motion and the switch turns the fan off. When the air conditioning system is in operation, the air conditioning relay supplies power to the fan relay via a fan diode downstream from the ignition switch. This diode activates the fan relay and keeps the fan operating as long as the air conditioning is on.Thanks. you can rate this solution and show your appreciation.
from memory the electric fan runs constant when air conditioning is turned on i would suggest the thermal control for the electric fan monted to the radiator is not functioning correctly is normally mounted to a flat spot on radiator