Engine Cooling Fan And Clutch Assembly P92
The engine cooling fan and clutch assembly consists of the
following components.
| • | Air pump and reservoir -- The air pump is gear-driven
by the engine. It supplies air pressure for the brakes as well as the fan
clutch. The reservoir ensures that there is always a sufficient amount of
air pressure. |
| • | Pressure regulator -- The pressure regulator is mounted on
the reservoir. It ensures that the fan clutch always has enough pressure to
engage. |
| • | Air filter -- The air from the compressor goes through a
filter/drier before it reaches the reservoir, but this small filter eliminates
any dirty, debris, or moisture that may have accumulated in the lines or the
reservoir. |
| • | Solenoid -- This device opens and closes in response to electrical
signals in order to allow air to flow or in order to stop the flow to the
clutch. Air that flows to the clutch will cause it to engage. |
| • | Toggle switch -- This switch is mounted on the instrument
panel. It has two settings. When moved to AUTO, the fan clutch engages only
when then engine has fully warmed up in response to the thermostat. When moved
to ON, the fan is engaged all the time. |
| • | Pneumatic clutch -- At rest, the clutch allows the fan to
freewheel. When the right amount of air pressure is applied, the clutch locks
the fan to the pulley. Air is then drawn through the radiator. |
| • | Fan -- The engine cooling fan has 10 blades and is able to
move a lot of air, even at low speeds. Because of the noise created by the
many blades, the pneumatically-operated clutch is designed to keep the noise
down when the fan is not needed. |
Engine Cooling Fan And Clutch Assembly P72
The engine cooling fan and clutch assembly consists of the
following components.
| • | Fan clutch -- The clutch is spring-loaded in
the engaged position and requires hydraulic pressure from the power steering
pump in order to disengage. In the event of hydraulic failure, the clutch
remains engaged in order to keep the engine cool. |
| • | Fan -- The engine cooling fan has 10 blades and is able to
move a lot of air, even at low speeds. Because of the noise created by the
many blades, the hydraulically-operated clutch system is designed to keep
the noise down when the fan is not needed. |
| • | Power steering pump and reservoir -- The pump provides the
system with fluid and pressure in order to disengage the fan clutch. The reservoir
ensures that there is sufficient fluid. |
| • | Pressure regulator valve -- The power steering pump provides
more pressure than is necessary in order to disengage the fan clutch. This
valve determines the amount of fluid pressure that is allowed to flow to the
solenoid valve and the clutch. |
| • | Solenoid valve -- This device opens upon an electrical signal
from the Alarmstat®. It directs fluid pressure to the clutch. |
