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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Control System & Fuel System - 6.6L (LLY) - Troubleshooting & Diagnosis) >> Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test) >> Leak Test - Air Pressure Application

Leak Test - Air Pressure Application

WARNING: This page is about a different variant/trim than selected.
CAUTION: Refer to Charge Air Cooler Caution .
IMPORTANT: Charge air coolers are not required to be leak proof. DO NOT test the cooler for leakage by submerging it in a radiator test tank. Almost all charge air cooler units will show leakage if they are submerged.
  1. Connect the filtered air supply to the air valve on the gage/regulator assembly.
  2. Open the air valve SLOWLY, increasing the air pressure in 34-69 kPa (5-10 psi) increments while listening for air leaks. Continue increasing the air pressure until the gage reads 205 kPa (30 psi).
  3. Close the air valve and monitor the gage for 15 seconds. Note any decrease in air pressure.
  4. Repeat the test 3 times to verify the results.
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