And full time vacuum for the Heater/A/C. This allows the heater to work, i.e., temp door, vent door, & defroster vent. Also, will turn off the water valve, no hot water flowing through heater core, when A/C is selected.
Purple tubing is vacuum supply into the firewall, gray tubing is vacuum out from control unit to the water control valve (in the heater hose). Be sure to include a vacuum reservoir and a check valve in case of engine backfire. Search the local salvage yard, any GM car will do.
Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
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CUBS - 2016 World Series Champions - Thank you, Joe Madden Ö enjoy your next chapter.