Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Fig. 2 Variable speed fan with flat bimetallic thermostatic spring
FAN SERVICE
To prevent silicone fluid from draining into fan drive bearing, do not store or place drive unit on bench with rear of shaft pointing
downward.
The removal procedure for either type of fan clutch assembly is generally the same. Merely unfasten the unit from the water pump and remove the
assembly from vehicle.
The type of unit shown in Fig. 2, may be partially disassembled for inspection and cleaning. Remove capscrews that hold the assembly together and
separate the fan from the drive clutch. Next, remove metal strip on front of clutch assembly by pushing one end of it toward the fan clutch body so it
clears the retaining bracket. Push the strip to the side so that its opposite end will spring out of place. Now remove the small control piston underneath it.
Check the piston for free movement of the coupling device. If piston sticks, clean it with emery cloth. If the bimetal strip is damaged, replace the entire
unit. These strips are not interchangeable.
When reassembling, install the control piston so that the projection on the end of it will contact the metal strip. Next install metal strip with any
identification number or letters facing the clutch. After reassembly, clean the clutch drive assembly with a cloth soaked in a suitable solvent. Avoid
dipping the clutch assembly in any type liquid. Install the assembly in the reverse order of removal.
The coil spring type fan clutch cannot be disassembled, serviced or repaired. If it does not function properly, it must be replaced with a new unit.
