Fan Clutch Oil Refill

I am just explaining the operation in further detail.

Fan controller using arduino. 12500 cst wont be a problem but will act a bit. You will see the thermostat spring on the front of the clutch that acts to tell the clutch how much or little to slip depending on the temperature of the engine. The higher the cst rating the higher the viscosity thicker fluid all priced the same.

It must be remembered that these types of fluid couplings always have some slip. Separate the fan from the clutch and flip her over. Thicker oil doesnt mean it will cool better but infact the clutch may remain permanently engaged which is a disaster itself as the fan can blow apart.

The toyota dealer says there are three types of viscous fan clutch silicone. Toyota silicone oil refill the fan clutch. They are rated at 3000 cst 6000 cst and 10000 cst.

Some other fan clutches even take 50000 cst oil doesnt mean you can use 50000 cst oil in your tiny light duty clutch specced for 10000 cst. There are two ways to check is your old clutch is working ok or it need to be re fill with silicon. Continue to rotate the fan and clutch and drip the oil into the grommet hole.

It also shows the same reason as above. To take the clutch apart remove the four phillips head bolts that ive circled in red. Heat the fan clutch while rotating the fan and clutch at a moderate speed.

Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. They may slip by 98 free spin or 5 coupled but there is always slip. 2 when your turn off your engine but fan keeps spinning for a while before fully stopping.

1 when engine is off. You move fan with your finger and it spins half or 1 full rotation. Credit goes to frank for his guide on how to split and refill the fan clutch.

This fix will not help if your fan clutch is mechanic.