HVAC/Blower motor not working sometimes?

[Wschnitz]

Having issues with the HVAC panel in my 1985 325e sedan, the blower motor stopped working, so i took it apart and it tested fine. Even ran fine when i plugged it back in and turned the key to position 2 without starting car. When i buttoned it all back up, went inside the car, bam, nothing HVAC works, like it was in the beginning.

TLDR:

HVAC completely unworking,
no ac/recirculate button function,
no heat knob function,
no fan knob function.

but fan worked and functions all work intermittently.

Is there a ground somewhere that could be loose?

[Wschnitz]

pls

[estoguy]

Did you try all 4 speed settings?

If you're getting blow on 4, it's your resistor pack.

[Wschnitz]

Not my first rodeo, its not the resistor. The entire HVAC panel occasionally stops working, meaning no functions work, fan/ac/etc

[dnguyen1963]

When something like this happens, it is generally because one of the grounds is momentarily disconnected.

[grke36m3]

any luck figuring this out? i have the same issue

[jlevie]

Bad ground , bad fuse, or bad connections to the HVAC panel.