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it could be the cooling fan relays or possibly the cooling fans. to check the fans disconnect the plug at the fans and run jumper wires to them both power and ground. if they don`t work then the fans are bad. check voltage and grounds at the plugs when they should be running, if they are good then the wiring is good. it could also be the coolant sensor for the fans that send the signal from the sensor to the computer so it knows when to turn on the fans. the fan that runs with the A/C when turned on could be the A/C relay.
it could be a possibility that the engine is running at normal temperature but your gauges are telling you that it is running hot the only way to tell is to get a temperature gauge & connect it into the water system somehow to give you an accurate reading or take the vehicle to a radiator repairer & they may be able to do it for you..........hope this helps.....cheers.
Turn vehicle off. Allow to cool. Raise hood.
Try to see if the fans spin freely by hand. If not, replace. If they do spin, proceed to next step.
Check coolant level, add if needed. Remember-radiator must be cool before opening cap. Make sure radiator cap is secure and tight if coolant was added.
Start vehicle. Observe coolant gauge as vehicle warms. Fans should come on when temp gauge reads halfway between c and h.
If fans do not come on see if they come on when you turn on ac or heat. If doing this makes them come on, suspect faulty cooling fan sensor switch. If they don't come on replace cooling fan sensor switch and fan relay.
Sounds like your cooling fans on the radiator are not working. The fans are activated by a thermol switch on the engine or radiator reading the coolant temperature and an A/C switch. When the coolant is too hot the fans should activate cooling the system down. And, when the A/C is on the fans should also activate in order to cool the condensate so the A/C would work.
When you are driving, the movement of the vehicle throught he air is providing enough air flow to keep things cool and functional.
I would check the radiator fan fuse or fuses first. If those are OK I would try to run the fans with 12 volts and a ground that I supply just to see if the fan motor(s) actually run when powered. If the fan don't run when powered then the fans are bad and will need to be replaced. If the fans do run when you power them manually, then something is not allowing the power to activate, like a relay, control unit, or wiring.
It will take a little diagnostics, but it is not too difficult to chase it down.
If the ac is turned on and it comes threw the defrost,then it is not the cooling fans,but check them to see that they are coming on,and they are turning fast,the control head is more likely the problem.
those fans can cost allot of money unless you get it used or off ebay or junkyard, I would first check the fuse and the cooling fan relay making sure its not faulty next also replace your temperature sensor, what it does it sense the temperature of your coolant in the engine and when it reach certain tempature it send information to the computer telling it to turn on the fan to cool down the engine down. its fairly cheap and it take 2 minute to replace; if the sensor is faulty the fan will not turn on automatically. next if you did everything and the fan still does not work You can pull the fan out and test it buy direct contact using some spare wire wires and touch it straight to the battery to the fans plug. it hard to believe both fans fail at the same time. keep in mind both fan work in sync, although the 2nd fan is only a back up help to cool the engine while AC is running.
CARS THAT USE ELECTRIC FANS HAVE A THERMOSTATIC SENSOR THAT TELLS THE FAN OR FANS WHEN TO COME ON BASED ON THE COOLANT TEMPERATURE. THIS SENSOR HAS GONE BAD. WHEN THE AC IS TURNED ON IT BYPASSES THIS SWITCH AND RUNS TO KEEP THE CAR COOL, BUT BY THE TIME YOU TURN THE AC ON THE CAR HAS BECOME TOO HOT ALREADY. YOU NEED TO REPLACE THE THERMOSTATIC SENSOR. THEY CAN BE A LITTLE PRICEY, BUT NOT A WALLET BUSTER.