A charge air cooler (CAC) test is a pressure test of the turbo intake system used to check for air leaks, cracks, or weak components between the turbocharger and the engine. It’s one of the most important diagnostic tests on turbocharged diesel engines, especially on semi-trucks.

A Charge Air Cooler Test verifies that the entire boost system can hold pressure. If the system can’t hold pressure, you’re losing boost, losing power, and using more fuel.

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