Heater fan switch

[3Dee]

After several years, mine appears to have gone all-or-nothing. The middle settings do not seem to work at all.
Switch or blower unit?

[davefiddes]

If the intermediate speeds aren't working then that points to the resistor pack on the blower. Probably fairly straight forward to debug with a multimeter.

[3Dee]

So maybe not the switch then?
This is getting to sound contortionist to me!

[deadscoob]

Is it worth taking the switch apart first to check it? My temp control stopped working, switch was taken apart, cleaned and put back together and all was fine.