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If the engine is running hot you may be low on coolant. Check this first. If coolant level ok, the rad fan may not be working to cool the engine. If the AC is operational, when you turn it on, the radiator fan should come on telling you the fan motor is ok. You still may have an issue with a fan control related to temperature. This can be caused by a fan relay/wiring/temp sensor/ecm. Make sure the thermostat is functioning properly as well
The most common reason for running hot at idle is the radiator fan is not running or pulling enough air thru the radiator. If you have a fan for the engine and one for the ac, the engine fan may not be working. The radiator fan should come on when the coolant reaches 220 degrees. The computer sends a signal to the fan relay.
There are 2 cooling fans one that runs Ono and off Witt he temp of the engine and 1 that runs when you turn on the ac. The fans wiring harness can hook up opposite ways. Meaning that the fans can run backwards if it is hooked up wrong. When the fans are running they need to be pulling air inward towards the engine not blowing out through the front of the car. This is the first thing I would check if it isn't running hot but the temp is above normal!!!
HOT WIRE COOLING FAN USING JUMPER WIRES TO BATTERY.IF FAN DONT RUN WHEN HOT WIRED FAN MOTOR BAD NEED REPLACING. IF FAN RUN WHEN HOT WIRED. CHECK COOLING FAN FUSE AND RELAY.IF ALL IS GOOD.YOUR ENGINE COOLANT TEMPERATURE SENSOR NOT WORKING.IT CONTROL COOLING FAN AT SET TEMPERATURE IF SENSOR OPEN OR FAULTY THE COOLING FAN WONT TURN ON.CHECK COOLING FAN WIRES FOR DAMAGE.IF ALL STILL CHECK OUT GOOD HAVE VECHICLE SCANNED FOR PCM FAULT.IF IT FAILS NO COOLING FAN WONT TURN ON.
If it was the thermostat, it would run hot all the time. Sounds more like the electric cooling fans are not working. Either the fans themselves are not working, or the coolant temperature sensor is bad and not sending a signal to the computor to turn them on. Have the fans checked first, then go for the sensor if it isn't the fans.
CHECK FUSE AND RELAY.IF ALL IS GOOD.HOT WIRE COOLING FAN USING JUMPER WIRES.USING CAR BATTERY.IF FAN RUNS.ITS GOOD.IF FAN DONT RUN.REPLACE FAN ELECTRIC MOTOR.ALSO SCAN IT. TO MAKE SURE COOLANT TEMPERATURE SENSOR IS NOT OPEN.MAKE SURE ENGINE COOLANT TEMPERATURE SENSOR AND COOLANT TEMPERATURE READS SAME ON SCANNER IF NOT REPLACE THE COOLANT TEMPERATURE SENSOR. SEE IF COOLANT TEMPERATURE IS BAD THE COOLING FAN OR FANS WONT RUN.
Is the fan running or do you have an electric fan? If fan isnt running or never comes on no matter what you do it will never run much cooler. If fan is good then you could flush the radiator a couple of times and that will help but if fan isnt working it wont last long
If the fan is working properly then you might want to check the INTAKE MANIFOLD for leaks or make sure the HEAD GASKET isn't blown. If the fan is NOT working properly, replace the fan and the pigtail that connects to it