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radiator blocked --fins or cores
head gasket or cracked head
electric fans not coming on
fan clutch /viscous fan hub inoperative
blocked cat converter
bad / no thermostat
If you want the reason to be closer then you have to include the conditions when the over heating occurs in your next post
if it has a viscous fan hub( clutch) replace it
blocked radiator cores
fins missing from radiator cores, timing, air /fuel ratio to lean
faulty head gasket /cracked head ( needs a compression test)
air lock in the cooling system
if electric fan check fuses and relay to start the fan
doubt it --- for sudden problems check items like fan operation if electric, viscous fan hub if fitted, blocked radiator fins / corroded fins, failed cat converter blocking exhaust.
run the fault codes to check for any sensor failure.
Engine overheating when idleing is a clear indication that the fan is not working. If it is an electric fan check temp sensor /relay or seized fan motor. If it is a viscous fan hub drive replace the hub as it is locking up tro drive the fan when the engine gets hot. If the engine cools down when start moving it is certainly to be in this area that you should be looking. A viscous hub after you start cold and apply about 2000rpm should produce a lot of fan noise which will die away after a few minutes. If you have no noise a replacement may be in order
If this vehicle is a 99 then its a electric fan ,the viscous fan version is alot older and has a fan belt that goes around a corner ,yes it has a pulley arrangement that allows the long belt to turn through 90 degrees with a viscous fan and this version is about 20+ yrs old ,if this is a 99 model then their is a thermo switch in the radiator but the later versions use a sensor and a relay ,If vehicle used in a city then you can always fit a manual overide switch as well .Nice motors these cars though they run for ever and a day
the one on the engine is probably a viscous type fan.It spins freely until the heat causes it to 'stiffen' up and assist in drawing heat off the radiator.Prior to this it is not needed and would only rob engine power and slightly affect fuel economy.Easy way to check if it is viscous,with engine off,just spin the blades.It should spin with a little resistance onlyThe electric fan on the radiator is switched on by a temp sensor or by using the air cond(unless it has another for this task).Hope this helps you.
I couldn't find the plug or wire on the diagram on my online resource, either.
The fan must have a cable going to it to operate, somehow, though, I agree. Engine Cooling FanRemoval & InstallationTo Remove:
Before servicing the vehicle, refer to the precautions at the beginning of this section.
Remove or disconnect the following:
Negative battery cable
Fan blade/viscous fan drive assembly from water pump by turning mounting nut counterclockwise as viewed from front - threads on viscous fan drive are right hand.
CAUTION Do not attempt to remove fan/viscous fan drive assembly from vehicle at this time. Do not unbolt fan blade assembly from viscous fan drive at this time.
Upper fan shroud attaching hardware
Upper fan shroud and fan blade/viscous fan drive from vehicle
CAUTION Do not place viscous fan drive in horizontal position after removal because silicone fluid in the viscous fan drive could drain into its bearing assembly and contaminate lubricant.
Four bolts securing fan blade assembly to viscous fan drive.
Install or connect the following:
Fan blade assembly to viscous fan drive.
Torque to: 17 ft. lbs. (23 Nm)
Fan blade/viscous fan drive assembly and upper shroud into vehicle
Fan shroud retaining screws
Fan blade/viscous fan drive assembly to water pump shaft
overheating at idle , stop lights , slow moving traffic or hill work indicates a fan not working problem
if viscous fan hub drive off the water pump -replace the viscous hub r if electric fans check the coolant temp sensor , 2 fuses and fan relay and fan itself
of course you could have the fault codes read to see if there is a air/fuel mixture problem
First if it is electric fan or Viscous Fan. If the electric, check if fuses are ok, connections fine, and if the motor works. If it is the Viscous Fan, there is not much you can do unless you want it to work permanently. Normally the fan will be moving slowly once the engine starts, than when the inner thermostat gets its temperature it kicks in a fan clutch and than the rotor starts spinning as fast as the engine, it is less effective than electric fans as it will only give you the rpm speed of the engine from 1000rpm to 5000rpm where the electric motors give up to 8000rpm.On the Viscous Fan check if it kicks in if not replace it or get someone who knows what he is doing to permanently lock it so it will turn even when engine is cold. Not recommended in normal climate.