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Home >> Chevrolet >> 2011 >> Impala LS, 3.9 M >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Mechanical - 3.5L - Repair Instructions - Off Vehicle (2 Of 3)) >> Coolant Crossover Pipe Cleaning and Inspection

Coolant Crossover Pipe Cleaning and Inspection

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    WARNING: Refer to Cleaning Solvent Warning .
  1. Clean the coolant crossover pipe with solvent.
    2. WARNING: Refer to Safety Glasses Warning .
  2. Dry the coolant crossover pipe with compressed air.
    3. Fig 1: View Of Front Of Coolant Crossover Pipe
    GM1706678Courtesy of GENERAL MOTORS CORP.
  3. Inspect the front of the coolant crossover pipe for the following:
    • Damage to the coolant fill adapter sealing surface (1)
    • Damage or restrictions to the radiator hose connection (2)
    • Damage or restrictions to the thermal bypass hose connection (3)
    • Damage, blockage, or excessive corrosion to the engine coolant passages
    • Damage or restrictions to any fastener threads
    • Damage or restrictions to any mounting holes
    4. Fig 2: View Of Rear Of Coolant Crossover Pipe
    GM1706681Courtesy of GENERAL MOTORS CORP.
  4. Inspect the rear of the coolant crossover pipe for the following:
    • Damage to the heater inlet/outlet sealing surface (1)
    • Damage to the coolant crossover pipe-to-cylinder head sealing surfaces (2)
    • Damage, blockage, or excessive corrosion to the engine coolant passages
    • Damage or restrictions to any fastener threads
    • Damage or restrictions to any mounting holes
  5. Repair or replace the coolant crossover pipe as necessary.
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