|
±22" Hg is normal and correct. You have a vacuum leak somewhere in the engine compartment to locate and repair, but for now you can bypass it and get full vacuum to the 7-port manifold for HVAC testing.
You may indeed have an electrical issue also. The 7-port manifold is a pretty rare failure, but the HVAC control unit is known to be problematic. Also verify the monovalve and auxiliary heater pump are not shorted (or low resistance, pulling more current than normal).
The blower is a separate issue, and if the fan speed varies with the high-speed button pressed, something weird is going on. It's not necessarily the regulator. A failed regulator generally results in either no fan at all, a fixed speed, or only variable between low and medium. The pushbutton unit sends a speed signal to the regulator, so if the control unit is sending a faulty signal, that could result in the odd fan speeds. Search the forum for more details on this, and/or the 500E board forum.
If you have a spare pushbutton unit, swap it out and see what happens.
|