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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> Charge Air Cooler Diagnosis (Full System Leak Test) >> Air Pressure Application

Air Pressure Application

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:

Refer to Charge Air Cooler Warning .

  1. Attach the EN 46091-1  outlet hose to the quick disconnect fitting on EN 47656-NA  .
  2. Connect the air supply to the air valve on the gauge/regulator assembly.
  3. Open the air supply valve slowly, increasing the air pressure to a maximum of 69 kPa (10 psi) while listening for abnormal air leaks.
    4. NOTE:
    • For accurate readings you must allow at least 30 s for the air pressure to stabilize.
    • The engine will not hold pressure if the gauge valve is turned OFF.
    • If an excessive air leak hissing sound at turbocharger outlet is present, rotate the crankshaft 90 degrees.
  4. Leave the air valve turned ON for the duration of the test.
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