Are fan clutches directional?
If the pulley is flat and in contact with the backside of the serpentine belt, direction will be counterclockwise. If the wrong direction fan clutch is installed, the engine will overheat from the lack of airflow across the radiator.
Which way does a fan go on a engine?
The fan should blow air toward the engine (i.e., same direction as the air flow when the vehicle is in motion). If the fan is not OEM, the air volume may be off and the electrical characteristics could be different. The wisest course is to remove the fan and install a GM supplied part.
What does reverse rotation on a fan mean?
Reverse direction for a ceiling fan is a clockwise motion producing an updraft. In the winter, when your heater is running, reversing your ceiling fan moves warm air near the ceiling down to the floor. This greatly reduces your energy use and can lower your energy bills by as much as 15 percent.
What makes a fan spin with a cluthc?
With a fan cluthc your fan will rotate constantly regardless. The clutch engages and locks the blade to it so that it spins faster than normal the hotter that it gets. The only time that your fan will not spin is when the motor is off. It is a common misconception that the fan will only spin when the clutch engages. Click to expand…
How can you tell when a fan clutch is going bad?
You should be able to audibly detect when the fan clutch engages, with an accompanying rush of air. At idle, as engine temperature increases, a thermal fan clutch will engage at a certain temperature. Torque-limiting fan clutches will disengage at a certain engine speed.
When to use a heavy duty thermal fan clutch?
Heavy-Duty Thermal Fan Clutch: This fan style turns the fan at 70-90 percent of the shaft speed when engaged for increased cooling. When disengaged, it turns the fan at 25-35 percent. It’s used with deeper-pitch fans (2 1/2″ of pitch), and works well with higher operating rpm.
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.
https://www.youtube.com/watch?v=hP2gP66ioBg