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I assume you mean engine cooling fans. The primary fan is bolted to the water pump and turns with the engine-always runs. The other fan is for when the engine begins to overheat. the coolant temp. sensor triggers it at high temp. You'll hear it kick in. My 1.8L Suby's have rarely utilized this electric fan. Be careful looking around under the hood. Both fans are right there on the front and ready to hurt you. If your car is overheating and this secondary fan has not come on, then it's not working. But you should look deeper to find out why the overheating is occurring-this fan is for "normal" overheating;long steep climbs etc.
Repair a water pump by checking your car for a failure in
the bearings. You can test for bearing failure by seeing if there is any
play in the shaft that is connected to the electrical fan blades, as
well as the drive pulley to the pump itself.
If you notice any free play in the shaft or the pulley, you will need to take the pump apart and replace the bearings.
Determine if the water pump failure is due to a leak in the
casing. Examine the water pump housing for leaking or water stains in
the drainage hole next to the pulley.
If water is dripping from this hole, then the seals inside the pump need to replaced in order to repair the pump.
Remove the Water Pump for Repair
Allow the engine to cool completely before removing any part
of the cooling system. Never open a radiator cap or plug while the
engine is still warm.
Disconnect the car battery. This will prevent the electrical fan from turning on while you are under the hood.
Drain the radiator of all fluid and disconnect the radiator
hoses. Collect the fluid with a plastic container and keep it in a safe
place until you are ready to put it back into the radiator.
Remove the fan assembly. This will include the shroud, the fan and the fan belt. Disconnect the electrical leads for the fan.
Remove the pulley for the fan belt as well in order to have access to the water pump.
Use a socket set to remove the water pump from its engine mount.
Open the housing for the water pump and replace the seals or
bearing as necessary. Some auto parts stores carry repair kits that
have both the seals and bearings for specific types of water pumps.
Reassemble the cooling system by replacing the water pump,
pulley, fan belt, fan assembly and radiator hoses. Refill the radiator
with the fluid.
Start the engine to see if the water pump repair was successful. Check for leaks before you take the car out on the road.
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.
The 4.0L engine is equipped with a reverse rotation (counterclockwise) water pump. The word REVERSE is stamped or imprinted on the cover of the viscous fan drive and on the inner side of t he fan. The letter R is stamped onto the water pump impeller. When replacing water pump, ensure proper pump is installed. Installation of the wrong water pump will cause engine overheating.
NOTE:On models with 4.0 L engine, front grill must be removed to access radiator draincock. Draining cooling system can be accomplished by removing drain plug from side of block as well as by loosening radiator draincock. Drain plug is located on lower left side of engine block.
Disconnect negative battery cable. Drain cooling system. Disconnect electric cooling fan connector. Remove electric cooling fan and electric fan shroud assembly (if equipped). Loosen, but do not remove, 4 water pump pulley-to-water pump hub bolts and 4 viscous fan-to-idler pulley nuts. Remove accessory drive belt. Remove 4 viscous fan to idler pulley nuts, and remove fan and shroud together. Remove 4 water pump pulley bolts and remove pulley. Remove power steering pump and bracket. Disconnect heater hoses and lower radiator hose at water pump. Remove 4 water pump retaining bolts. Remove water pump.
I'm not familiar with your exact car but a friend of mine had a similar problem the solution was to replace the electrical relay for the cooling fan. Consult a wiring diagram to see if there is a relay (there should be) and replace it.
The other possibility off the top of my head is a short in the wiring somewhere. Power the fan directly and ensure it works fine. If the fan is OK then the problem is likely in the wiring or wire connectors somewhere. That should help narrow down the problem. Good luck!
I just had my coolant flushed and my radiator cooling fan replaced. The car was slightly overheating and would "gargle" in the coolant bowl after I turned the engine off. It turned out to be the radiator was clogged up on one side.
I went full tilt and replaced the radiator, water pump, thermostat, radiator cap and timing belt. I have 85,000 miles on the car and it was about time to do these things anyway. It is running like a new car now.