EA82 heater fan control switch replacement

[Rust]

So my  88GL heater fan is only blowing with speeds 1-3.  To get speed 4 to work I have to press down on the knob.  I don't think it is a relay issue, just the knob/unit on the dash is worn out and needs replacing.    So how can I replace the control knob/unit on the dashboard without tearing up the whole dash?

 

 

I'm thinking if I pop off the square access port next to the knob unit, I can then pull out the unit through the square hole. (if it is indeed a square hole behind the cover plate)   Any ideas?  Anyone done this before?

[DaveT]

It won't fit through the small hole. The section with the fan switch and buttons comes off without removing the entire dash.

 

If no one else replies before tonight, I can look at more specifically how to get the piece it mounts in off. It might be the trim piece around the top section and instruments.

[l75eya]

you gotta carefully pull off the selection buttons. The AC and HEAT and BI-LEVEL and defrost buttons all pull straight out. Just be careful not to break them. The easiest way I think to do it is to pull off the 1-4 fan speed switch first, and then work your way up, Behind some of those selection buttons are screws that hold it all together / in. I don't remember which ones specifically, but they're there.