Why does the fan clutch not turn at engine speed?

In this mode the movement of the silicone fluid is restricted, thus causing the fan clutch to free-wheel (to a certain degree in relation to the water pump’s Pulley) and so the fan clutch does not turn at engine speed. This mode is the one that provides the least cooling effect by pulling the least air across the radiator and A/C Condenser.

How to test a fan clutch on a Chevrolet?

How to Test a Fan Clutch on a Chevrolet. 1 Step 1. Put your safety glasses on and climb under the vehicle with your flashlight. Look up at the underside of the fan clutch and inspect for any 2 Step 2. 3 Step 3. 4 Step 4.

How does a torque limiting fan clutch work?

A torque-limiting fan clutch reacts to engine speed. A centrifugal valve opens to allow the flow of heavy silicone fluid, locking the fan blades to the pulley. At idle and low engine speeds, this fan clutch is fully engaged, gradually disengaging as engine speed increases.

What to do if you have a bad fan clutch?

Raise the hood, with the engine off and cold. Reach in and spin the fan blade by hand. If it continues to spin freely for more than five turns with no signs of drag, you have a bad fan clutch.

What happens to the engine when the fan clutch fails?

As the fan clutch is one of the main cooling system components, it is very important to the proper operation of the engine. When it fails, the engine can be put at risk of serious damage due to overheating.

Is there a case study for a bad fan clutch?

Although this is a case study of a 2003 Chevy Express Van (with a 6.0L) that belongs to a buddy of mine (Oscar), you can apply the testing tips and info to any thermal fan clutch equipped vehicle. So, whether you’re driving a GM 4.3L, 4.8L, 5.0L, 5.3L, 5.7L, or any Ford, Chrysler vehicle, etc., this info will help you.