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climate control units in most cars use the ac system to regulate temp in the cab. the ac system requires a fan to pull air over the condensor on the front of the car. its normal for a fan to come on. unless you have a bad engine temp sending unit thats causing the engine cooling fan to come on improperly.
try turning off the heat and ac and see if it still comes on.
The auxillary fan is used for AC cooling purposes, and your vehicle
under normal circumstances should not overheat regardless of the status of the auxillary fan.
That being said, the auxillary fan is controlled by the PCM based on AC switch position via a fan
control relay in your fuse box under the hood. There is no fan switch
for it, as it is turned on based on PCM observance of AC control switch position.
Some things to look at regarding your overheat condition:
When the vehicle begins overheating, what are the conditions of the radiator hoses? Are both firm, or only one and the other soft? Are both hot, or is one hot and the other only warm?
Both a failed waterpump and a failed shut thermostat will show a hot hose on one side and only a warm hose on the other side of the radiator.
A failed (stuck shut) thermostat will also result in one very firm hose (highly pressurized and nowhere to go with the thermostat shut) and one relatively soft hose.
You can take the radiator cap off (BEFORE it pressurizes) and watch the water level as the car runs. If the thermostat is opening and waterpump is pumping, you will see fluid flow once it gets to operating temperature.
Watch your engine fan and see if it is engaged or just spinning freely. When warm and the engine shut off, the fan clutch should be engaged making the fan more resistant to turn. If it spins freely, the clutch is failing.
Check the area around the radiator and between it and the condenser for obstructions to airflow.
Obviously check the condition of the coolant for heavy scale/sludge. The 3.0/3.5 engines are notorious for turning coolant into thick rusty puddy.
It sounds like the auxillary fan motor is dead. It only comes on when the car heats up to a certain point and automatically when the air conditioner is turned on. Since it's making a terrible sound, you may check to see if something is lodged in the fan. Outside of that, just replace it. The fan should probably cost you around $100. (that's just my guess though) I'd probably go to junkyard and pull one off of something there. Would be much cheaper. The two fans are probably mounted in the same plastic shroud so you'll have to remove them both to replace the aux fan. You can still drive it without the a/c on, but I wouldn't be in bumper to bumper traffic for 35 minutes at a time. As long as you are driving, you don't even need the fans going, the air going across the radiator from driving will be sufficient to cool it down. Just watch your temp gauge if you are idled for too long and you can shut the motor off, leave the key on and the fan will continue to blow. Good luck.