The leading chevrolet community for owners and enthusiasts. Truck, gmt 400, 800, & 900 Gm has opened a new customer satisfaction program to cover the replacement of engines with contaminated blocks. 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.
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