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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 631 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSCOOLANT AIR BLEED PIPE ASSEMBLY REPLACEMENTREMOVAL PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal Procedure
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Important:  Removal of the intake manifold is NOT required to service the coolant air bleed pipe, but is required to service the coolant air bleed pipe covers and/or gaskets.

  1. Remove the intake manifold, if required. Refer to INTAKE MANIFOLD REPLACEMENT in Engine Mechanical - 5.7 L.
  2. Remove the coolant air bleed hose from the throttle body, if required.
  3. Remove the coolant air bleed pipe studs (1).
  4. Remove the coolant air bleed pipe (2) with gaskets (3).
    Fig 1: Removing Coolant Air Bleed Pipe With Gaskets
    G01971775Courtesy of GENERAL MOTORS CORP.
  5. Remove the coolant air bleed pipe cover bolts (1), if required.
  6. Remove the coolant air bleed pipe covers (2) with gaskets (3), if required.
    Fig 2: Coolant Air Bleed Pipe Covers
    G01971776Courtesy of GENERAL MOTORS CORP.
  7. Remove the gaskets from the coolant air bleed pipe and covers. Discard the gaskets.
    Fig 3: Removing Gaskets From Coolant Air Bleed Pipe & Covers
    G01971777Courtesy of GENERAL MOTORS CORP.
  8. Remove the coolant air bleed hose (2) from the pipe (1).
  9. Clean and inspect the coolant air bleed pipe. Refer to COOLANT AIR BLEED PIPE CLEANING AND INSPECTION in the Engine Unit Repair Manual.
    Fig 4: Removing Coolant Air Bleed Hose From Pipe
    G01971778Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.