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secondary air injection check valves on 2005 Chevrolet Avalanche 1500

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were are the secondary air injection check valves
(1) Answer
The secondary AIR injection check valves on your 2005 Chevrolet Avalanche should be located at the end of each of the AIR tubes attached to the right and left exhaust manifolds. The check valves separate the metal AIR tubes from the rubber AIR hoses.