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Home >> Chevrolet >> 2008 >> Optra5 LS, Standard >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling >> Diagnostic Information and Procedures >> Pressure Cap Testing >> Tools Required

Tools Required

J-36649  Cooling System Pressure Test Adapter. See Special Tools .

The surge tank cap maintains proper pressure, protects the system from high pressure by opening a pressure valve, and protects the coolant hoses from collapsing because of a vacuum.

  1. Wash any sludge from the surge tank cap and the valve seat of the vacuum pressure valve for the surge tank cap.
  2. Inspect for any damage or deformity to the vacuum pressure valve for the surge tank cap. If any damage or deformity is found, replace the cap.
  3. Install a suitable cooling system pressure tester to the cap using the J-36649  (1). See Special Tools .
  4. Pull the vacuum pressure valve open. If the surge tank cap does not seal properly, replace the surge tank cap.
  5. Pressurize the cap to 90-120 kPa (13.1-17.4 psi).
  6. Wait 10 seconds and measure the pressure held by the tank cap tester.
    7. Fig 1: View Of Cooling System Pressure Tester And J-36649
    GM1291055Courtesy of GENERAL MOTORS CORP.
  7. If the pressure held by the cooling system pressure tester falls below 80 kPa (11.6 psi), replace the surge tank cap.
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