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The main cooling fan on this 1999 jeep cherokee, the main fan all depends.
These jeeps come with diffrent fan set ups. Here are a few, the first may be a fan driven off the motor by a fan belt and a another fan which is electric. the primary fan used for cooling is the fan that runs off the engine with a belt. the other electric fan is more the air conditioning system, this fan is used for cooling the condensor mainly. the engine driven fan is for the cooling system.
Another system fan set-up on these jeeps would be the motor driven fan by belt with another electric fan in front off it, the diffrence between the first and this one is that the first fan system is side by side and this one is set-up one in front of the other but the concept is the same, the fan driven by the engine is mainly for the cooling of the engine coolant and the electric fan is for air conditioning cooling.
In both set-ups the electric fans also help the cooling system but are mainly used for the help in cooling when the a/c is turnned on, the a/c condensor builds up heat the same as the radiator does, one fan is unable to cool both the radiator and the condensor, this is why some cars have two fans.
ELECTRIC Cooling Fans are Controled By 1) Coolant temp Sensor 2) Cooling Fan RELAY 3) Power source TO the RELAY ( Fused ) UNPLUG the Cooling Fan PLUG @ FAN Itself
Use DIRECT CURRENT AT the FAN PLUG<< +POS & --NEG FROM BATTERY ONE BRIGHT COLORED WIRE at FAN PLUG is +POS. the Other is --Neg If the Fan COMES ON then your Problem IS BEFORE the FAN @ ONE of the 3 OTHER COMPONENTS ABOVE
check fuse and relay.if all is good.hot wire cooling fan using jumper wires to battery.if fan dont run replace the fan.if fan does run you have a open wire or bad connection at cooling fan electrical connector.
doubtful fuse blown,but Make sure all the air is out of cooling system,by bleeding it out or filling coolant reservoir ,and radiator full.Then run engine to about 210 degees,or close,then turn engine off.Wait about 30 to 40 minutes,and reservoir should have dropped in the level of coolant.Then add more coolant and repeat as nessasary for the fan to come on.Then make sure the fan goes ogg on it`s own.Then you will know the system is ok.Do this with ac,and heat off.
cooling fan fuse should be third up from bottom on right on cabin fuse block. there may be another in power distribution center under the hood. Not sure if you mean radiator fan. to check, first hot-wire fan to battery. if it runs check fuse and relay. Radiator fan operates like this: coolant sensor sends signal to computer that sends ground signal to fan relay that then completes power circuit to fan. Difference in cabin fan is that the dash control sends signal to relay, then to resistor bloc, to fan motor.All electrical components require power and a good ground to operate properly.
If the electric cooling fan is inoperative, check the 15A fuse in the junction block and the 40A fuse in the Power Distribution Center (PDC) with a 12 volt test lamp or DVOM. Refer to the inside of the PDC cover for the exact location of the fuse.
the fan relay may have went bad...if the fan doesnt come on the compressor will shut down because of excessive pressure...has he used a test light to check all the fuses under the hood and inside... pay particular attention to fuse 10 in the inside fuse box...if there is no power at all to that fuse it may be in the ignition switch
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