I do have a vacuum schematic for the emissions control systems. Also, the HVAC actuators are controlled by an engine vacuum.
Pic 1 below is the emissions system schematic and pic 2 is related to the HVAC circuit.
If you are looking for a leak, here is a link you may find helpful:
Let me know if this helps or if you have other questions.
See pics below.
Images (Click to make bigger)
Friday, December 9th, 2022 AT 10:39 PM