[JANNETTYRACING]

Originally Posted by 2013 ZL1 #7860

The tool is used to make sure the actuator diaphragm is operating in the correct range of motion (not too far in or out) and in a perpendicular line to the diaphragm inside the actuator (not at an extreme angle up or down). The set screw is used to make the final stop adjustment on the bypass butterfly valve and should have a slight gap to account for the expansion of the metal when the engine is warm. It is a good idea to make sure these items are adjusted correctly and I do not think it is safe to "assume" GM built a perfect car, everything has a range of specs they say is acceptable and in this case that range can be large and mistakes can be made easily. Also, if your blower was replaced under the spring coulpler TSB, then I would check this immediately because a tech making flat rate for the replacement probably didn't care nearly as much as you would. IMHO

Well Said.

Ted.