Fan And Fan Clutch Replacement - GMC G Service Manual

DRIVE BELT ROUTING
Refer to the drive belt routing diagrams if belt replace­
ment becomes necessary. Refer to figures 32 through 43.
DRIVE BELT REPLACEMENT — SERPENTINE BELT
1. Remove the old belt (figure 44).
• With a socket and breaker bar, release the ten­
sion by turning the tensioner pulley assembly.
The tensioner pulley is spring-activated and it
can be turned to the left or right to apply or
release the pulley tension.
2. Install a new belt.
• Thread the belt around the pulleys.
• With a breaker bar apply the tension by turning
the tensioner pulley assembly.
DRIVE BELT ROUTING — SERPENTINE BELT
Refer to drive belt routing diagrams if belt replacement
becomes necessary (figure 44).
FAN AND FAN CLUTCH
REPLACEMENT
M Remove or Disconnect (Figure 45)
1. Radiator fan shroud. Refer to RADIATOR
(SEC. 6B2).
2. Nuts (75).
A. 1st Track
B. 2nd Track
C. 3rd Track
50. Water Pump Pulley
51. Crankshaft Pulley
52. Generator Pulley
53. A.I.R. Pump Pulley
54. Power Steering
Pump Pulley
55. Air Conditioning
Compressor Pulley
Figure 41 — Engine Accessory Drive — 4.8L Engine (P-Models)
ENGINE COOLING 6B1-31
3. Fan (73) and fan clutch (74) from the water pump
pulley (70).
4. Bolts (72).
5. Fan (73) from the fan clutch (74).
M Install or Connect (Figure 45)
• Inspect the mating surfaces (the water pump hub and
the fan clutch hub) for smoothness and rework as
necessary to elim inate any burrs or other
imperfections.
CAUTION: Do not repair and reuse a fan with a
bent or damaged blade. Replace the fan as an
assembly. A damaged blade can change the bal­
ance of a fan. A fan out of balance could fly apart
during use and create a dangerous condition to
the owner and vehicle.
1. Fan (73) to the fan clutch (74).
2. Bolts (72).
H O Tighten
• Bolts (72) to 25 N»m (18 ft. lbs.).
3. Fan and clutch assembly to the water pump pulley
(70).
4. Nuts (75). Align the yellow reference marks on the
water pump hub and the fan clutch hub.
H O Tighten
• Nuts (75) to 25 N-m (18 ft. lbs.).
5. Fan shroud. Refer to RADIATOR (SEC. 6B2).
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