The best source for chevrolet news, reviews, rumors, and ownership information Truck, gmt 400, 800, & 900 Chevrolet technical service bulletins check for technical service bulletins (tsbs) on your vehicle by make, model, and year. How to replace blend door and actuator a stuck blend door actuator can have you melting in the heat or freezing in the cold Replacing those faulty units is unfortunately a tedious process, requiring removal of the entire dash, as explained here. Gm has opened a new customer satisfaction program to cover the replacement of engines with contaminated blocks.
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