Thanks Ray, but part 14 isn't the correct part. What I need is a white plastic shaft about 3/8" thick by about 2 inches long, which connects the actuator motor part number 13 to the valve (door) part number 16, I've purchased both 13 and 16 as well as all of part number 1, the entire HVAC case, that white shaft is not included with any of the surrounding parts nor identified on the schematic. I've now been to 2 different parts departments at Chevy dealers and both have shaken their heads and said "have a nice day". Just got off a GM direct chat line to Customer Service and was told the ve