Engine Size: 350
Refrigerant Type: 134a
does anyone know when the solenoid that sends vacuum to the heater control valve should be working?
i've tried max recirculate and checked for power, it seem to be a pos 12 controlled solenoid since it always has a ground on one side, but never gets 12v to power it up.
i have a manual, but it doesn't show anything in the wiring diagrams about it. i'd like to check where it should be getting power from. like the dash controls, or the ecm. and when it should have power. i know gm does some weird should about when it lets you recycle air. maybe this doesn't just divert hot water when on max like my other cars?
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