89 300E Blower Motor Checked, but controls don't work

[dbertrand]

My blower motor wasn't working. I put 12 volts to it and it works great. It even sounds good. The heater gets hot and the AC gets cold. The control buttons are non-reponsive, though. I can hear clicking in the dash when I press the buttons so I know something is happening.
All fuses are good, fusible link is good. The red lead to the motor is always hot (when car is on) so I installed a temporary switch to turn the blower on by grounding the other terminal. This is good since it is freezing at night here, but I would rather have normal control back. Does not blow out center vents at all.
Can anybody explain what might be going on?
One last thing...I hear a gurgling sound in the center dash sometimes after the vehicle has warmed up and the blower is off. It's the oddest thing.
Any help would be appreciated.