Hummer H1 Service Manual page 187

4-4 Cooling System
RADIATOR AND FAN SHROUD ASSEMBLY
SERVICE
Removal
1. Remove hood (Section 10).
2. Drain cooling system.
3. Remove oil cooler (Section 1).
4. Disconnect upper hose from radiator (Figure 4-4).
5. If equipped with air conditioner, discharge system and
remove condenser (Section 11).
6. Remove power steering cooler mounting bolts and
position cooler aside.
7. Disconnect ambient temperature switch, if equipped
(Section 11).
8. Disconnect surge tank-to-radiator vent hose from adapter.
9. Disconnect lower radiator hose from radiator.
10. Remove strap securing fan shroud to radiator.
11. Remove lower mount from radiator and frame bracket
(Figure 4-5).
12. Detach rear support brackets from airlift brackets
(Figure 4-4).
13. Remove battery tray, and left splash shield. (Sections 10
and 12).
14. Remove the radiator from vehicle (Figure 4-5).
15. Remove retaining strips, and fan shroud from radiator.
16. Remove rear support brackets and insulators from
radiator.
SURGE TANK-TO-RADIATOR VENT HOSE
RADIATOR
UPPER RADIATOR HOSE
REAR SUPPORT BRACKET
____________________________________________________________
HOSE FITTING WITH BLEED VALVE
STRAP
FAN SHROUD
Figure 4-4: Radiator and Fan Shroud Assembly Mounting
Cleaning and Inspection
NOTE: Clean all components, examine for wear or damage,
and replace if necessary.
1. Remove debris embedded in radiator fins using water and
compressed air (Figure 4-5).
2. Inspect radiator for breaks, punctures, cracks, or splits.
3. Inspect adapters and fan shroud (Figure 4-4).
Installation
CAUTION: To avoid equipment damage, upper edge of fan
shroud must align with radiator top tank seam to ensure
proper engine cooling.
NOTE: Ensure fan shroud edge aligns with tank seam on radi-
ator.
1. Secure fan shroud to radiator with retaining strips, lock-
washers, and bolts. Tighten bolts to 6 lb-ft (8 N•m)
(Figure 4-5).
2. Secure rear support brackets and insulators to radiator
with washers and locknuts. Tighten locknuts to 26 lb-ft
(35 N•m).
3. Align radiator with frame bracket, and rear support
brackets with airlift brackets (Figures 4-5 and 4-6).
4. Fasten rear support brackets to air lift brackets with bolts,
washers, and locknuts. Do not tighten locknuts
(Figure 4-4).
ADAPTER
AIRLIFT BRACKET
LOWER RADIATOR HOSE
®