A fan clutch is designed with a temperature sensitive spring that is used to control the engaging and disengaging of the fan depending on the temperature of your engine. As you drive faster, the temperature of your engine creeps up and eventually causes this spring to expand, thereby engaging the fan clutch. Internally, the fan clutch is made up of a set of clutch plates and a coupling filled with a silicone based oil with an internal valve that opens and closes directing the flow of the oil between two separate cavities. One of these cavities acts as a reservoir and the other goes into the clutch itself. When this valve opens, fluid enters the clutch assisting the fan in turning faster. As this valve shuts, this oil flows back into the reservoir which causes the clutch to slip, forcing the fan to turn much slower.
How to replace fan clutch:
1. Check for Fan Clutch Problems
The first thing that needs to be done is to be sure that the problem is with the fan clutch. A quick visual inspection of the fan will give you an idea if it is already calling for a replacement. You also have to listen to the sound when the engine is turned on. If there is an annoying and loud sound, this is another indication that it needs a replacement.
2. Remove the Fan Clutch
Once you are sure that the fan clutch is problematic, procced to having it removed. Before you can access the fan, you have to remove the air intake hose, fan shroud, and the belt. Use the screwdriver to take off the intake hose. Once the screw is loose, take it off and wiggle the hose until it is completely moved out of its place.
3. Remove the Fan
After removing the shroud, you will now have easier access to the old fan and you can have it removed. Use an open-ended wrench to remove the bolts that are attached to the fan. In the case of some designs, you will need to use a pulley locking tool. The latter has the main purpose of preventing the movement of the pulley while you are removing the nut.
4. Install the Fan Clutch
Once you are done with the removal of the old fan clutch, now is the time to have it replaced with a new one. Hold it in place while aligning the bolts. Fasten the bolts and see to it that it is secured. This is an important part of the process. If the fan is not properly positioned, it can loosen and can cause problems in the engine.
5. Install the Shroud and the Hose
After the installation of the new fan clutch, you have to return everything that you have earlier removed. This will include the fan shroud and the air intake hose. See to it that you will bring them back to their original position. As with the fan clutch, check the bolts and the screws to be sure that they are as tight as they should be.