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the cab heater fan?, there can be 4 fans on some cars. front condenser, 2 on rad, and 1 in cab heater box. the cab fan? does it fail on high too? it has a switch, (marked fan speed) the switch is bad ,if low speed are dead. and high are good. or wiring to it , the motor or the fuse. even a cracked fuse, change the fan fuse to a new fuse.
Check to see if the fans are connected to the wiring harness, if radiator was removed the shroud and fans had to be removed, are fan motors connected to wiring harness, are there any damaged wires at connectors, check the fans fuses at fuse box (Power Distribution Box) in the engine compartment (front right side)(push in on tab in front of box lift up then back to remove cover), Engine Cooling Fan Fuse, Yellow 60 amp, posistion #49, Check the Relays, Engine High Speed Cooling Fan, posistion #R8, Engine Cooling Fan, posistion #R9.
If you have two electric fans the fan on the passenger side of the vehicle is the radiator cooling fan, that fan should run when the motor gets to hot. The fan on the driver side is the ac condenser fan that fan runs only when the a/c is turned on. The only time that both fans run is if the a/c is on and the motor or coolant is above normal tempeture.
This indicates that the booster fan for AC has failed. If you look in back of the radiator, you will see 2 electric fans. One is for the engine cooling, and the other is a booster for when the AC is running to provide for extra air flow through radiator and AC condenser. (May also apply when engine overheats, but not sure of that) As car is moving along, then air is pushed through allowing AC to work. When standing still, and fan failed, then no air (or less air) passing over condenser grill. (Condenser is the one in front of the radiator) No cool.
While standing still with engine running, open the hood and look at fans. Watch your fingers. Fans can start at any time. One may be running or not. Now turn on AC and look at fans. Both should come on together. If not, then it may be either the fan, or the fan relay or fuse. Or even the wire.
Does the engine get extra hot while standing still running? Let it sit there for ten mins or so and see if main fan kicks on. Watch your temp gauge, you dont want it to boil over. When the temp reaches the level it is at normally, one fan should kick on. If temp keeps climbing and no fan, then that may be the same issue, likely the main relay.
Check to see what else shares the same fuse with the radio. If cigarette lighter is on it could be a penny or something stuck between the lighter and socket. That would be because when it is hotter the ac is working harder to cool the car, forcing the ac condenser to heat more. Make sure all fans are kicking on to cool it down. Most cars have two fans one for when ac is off and one for when its on. So make sure both are kicking on or that one is kicking on and off with two different speeds. You can hear the fans kicking on and off when the car is on in park. If you don't hear fans kick on check fan fuses, relays, and fan motors.
If the motor does not sense it is getting too hot, the fans will not come on. When it reaches a certain temp, they will come on. If you are having problems with over heating, and the fans are not coming on, I would suspect the fan temp sensor, or the PCM.
the thermostates on the 3400 engines are late because the fans kick in at the last moment. if you run your ac on you will notice that the gauge stays in front of the half mark or right on the half mark. that is because when you turn on your ac your fans will kick in earlier and stay on the whole time the ac is on. if you run your car with the heat on or nothing on that leaves the late thermostate to kick in verus you turning on your ac and it by passes the thermostates and runs the fans once the engine gets at at lest 120 deg. i use to have a 2002 and i had the same problem. this will keep your engine cooler. also if you don't want your air on just turn on your windshield defrosters (not the back windshield) and that helps keep your engine cool because your defrosters use your air compressor which is really your ac. so it still kicks the fans on earlier.