One thing I need to do and everyone should be aware of if your going with a monovalve replacement like my setup. Install a one way vacuum valve in the line so vacuum cannot reverse when you shut the engine off!

If you don't, your engine will not shut down like it's supposed to if you just shut down the climate control and turn the motor off at the same time!

The vacuum from the heater valve will return into the line to the vacuum pump and accessories and neutralise the shut down procedure!

If you shut off the climate control and wait a few seconds before turning the motor off, no problem!