Fresh air blower controls Options

[era vulgaris]

So after a year I've finally gotten around to troubleshooting why my fresh air blower fan doesn't work. Some deoxit and scraping away crud with a long screwdriver got the low and mid settings on the fan to work. It seems though that the little borders that create a detent in the slider movement between settings is preventing the contact arm from reaching the third setting. It's like the contact arm isn't long enough to make it over the last detent border. Anyone know if there's anything that can be done? Any adjustments?

You can (hopefully!) see how much bigger the last detent is in the pic. Not an easy shot to get through the ashtray hole!!!

[Valy]

It happens because the fan motor is old and dirt interferes with its movement. As a result, it draws more current and melts that contact.
Clean the motor and re-grease it. Maybe you need to re-bush or just replace it.
Clean that contact, remove any melted plastic that can interfere with the moving arm.
You may want to remove that speed at all. You can shift the wires and get rid of the lowest speed that doesn't do much anyway. Then just add a stopper so you don't go over the middle contact (or remember that the fan lever will not work all the way to the right)