Fan Blower Slide Control

I have a 1988 190E 2.3. The A/C-Heater blower control slide is stuck in the full speed position. That's OK for the Kansas summer heat, but before winter hits I'd like to have the ability to slow the fan down. I can get the part relatively inexpensively but the manual I have does not give any detail as to how to get at/remove/replace the swunit. Any suggestions would be helpful. I have gotten as far as being able to see the top of it by removing the middle vents, but I can't seem to determine how to get the middle console out.