Inspection Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the water crossover for the following:
- Corrosion, leakage or damage to the engine coolant plug (1)
- Corrosion or damage to the water pump drive belt tensioner/shield mounting bolt holes (2)
- Corrosion or damage to the water pump sealing area (3)
- Corrosion or damage to the gasket sealing surfaces (4)
- Corrosion or damage to the plenum duct sealing area (5)
Fig 1: Checking Water Crossover (1 Of 2)
Courtesy of GENERAL MOTORS CORP.
Inspect the water crossover for the following:
- Corrosion restrictions or damage to the seal/gasket sealing surfaces for the following:
  - MAP sensor vacuum source port (1)
  - Brake booster vacuum hose source port fitting (2)
  - Fuel pressure regulator vacuum tube source port fitting (3)
  - EVAP emission canister purge valve port (4)
  - EGR valve port (8)
  - EGR inlet pipe port (10)
  - Throttle body mounting surface (18)
  - A.I.R. valve vacuum tube source port (19)
- Corrosion or damage to the threads for the following connections:
  - EVAP emission canister purge valve mounting bolt hole (5)
  - Fuel rail bracket mounting bolt hole (6)
    
    Fig 2: Checking Water Crossover (2 Of 2)
    Courtesy of GENERAL MOTORS CORP.
  - EGR valve mounting bolt holes (7)
  - EGR inlet pipe mounting bolt holes (9)
  - Heater inlet fitting hole (11)
  - Water pump cover bolt holes (13)
  - Engine coolant outlet fitting hole (16)
  - Engine lift bracket bolt holes (17)
- Corrosion or damage to the fastener bolt holes (12)
- Corrosion or damage to the water pump mounting tabs (14)
- Corrosion or damage to the radiator hose outlet (15)
Inspect for damage or serviceability the following components:
- Water pump and seal
- Thermostat and seal
- Water outlet
- Water pump cover and seal
- MAP sensor and seal
- Accelerator control cable bracket
- Throttle body
- Throttle body gasket
- Throttle body spacer
- EGR valve
- EGR bracket shield
- EVAP emission canister purge valve
- Rear lift bracket
- Engine coolant outlet fitting
- Heater inlet fitting
- Bolts and fasteners
Repair or replace the water crossover and/or components as necessary.