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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 271 (Engine Mechanical - 4.8L, 5.3L, 6.0L Or 6.2L (4 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 3) >> Engine Coolant Air Bleed Pipe and Hole Cover Cleaning and Inspection

Engine Coolant Air Bleed Pipe and Hole Cover Cleaning and Inspection

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Coolant Air Bleed Pipe Seal
    GM1552485Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not use the engine coolant air bleed pipe and cover seals again. Upon installation of the pipe and covers, install NEW seals.
  1. Remove the seals (308) from the pipe and covers.
    2. Fig 2: View Of Coolant Air Bleed Pipe Components
    GM1658230Courtesy of GENERAL MOTORS CORP.
  2. Clean the pipe and covers in solvent.
    3. CAUTION: Refer to Safety Glasses and Compressed Air Caution .
  3. Dry the pipe and covers with compressed air.
  4. Inspect the pipe and covers for restrictions within the pipe (1) or damaged sealing surfaces (2, 3).
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