Is your defective GMC Sierra 3500 actually a LEMON?

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GMC TSB #21NA237

2021 GMC Sierra 3500

TSB Document:

MC-10205563-9999.pdf

Affected Component: EQUIPMENT

Summary: THis technical bulletin provides a procedure to perform a cooling system flush to remove possible debris from the cooling system pipes.

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Date Published: NOV 18, 2021
NHTSA TSB #: 10205563

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