The A/C season came and went and I appreciate everyone's advice. After tinkering for several hours today I think I have this nailed down and need a sanity check from the group. It's a 2004 E53 3.0 with 110K miles.

**I think it is the HVAC control module** and need advice/confirmation.

I can see the clutch kicking on and activating the A/C compressor and see the front part of the compressor spinning very clearly (vs not spinning with A/C off). Vents are blowing *warm* air at normal engine operating temp with Max A/C on.

I got a lead to check the heater control valve. I disconnected the plug for it and it appears grounded well when touching my multimeter to + battery and neg to the valve or valve body.

I checked the heater control valve plug's voltage per https://www.pelicanparts.com/techart...eplacement.htm and I am only getting +0.03 Volts when the heat is set to 90 degrees or I have Max A/C and 60 Deg setting. I am supposed to be getting approx 12VDC when on Max A/C.

Fuse 48 (7.5amp) is good.

The HVAC control module "looks" fine and doesn't act strange in any way but am assuming a bad component or bad solder joint is possible?

Should I attempt to jumper 12VDC to the heater control valve (add 12VDC to the tan/orange wire) to see if I get A/C? Anything else I can check? SHould I pick up a used HVAC control module from Ebay?