W108 blower

[kpb]

OK, have a new heater fan switch installed (along with all new heater controls) and have cleaned up and lubed the squirrel cage accessible under the cowl. Before I button up the dashboard are there any mystical incantations or procedures I should go through to diagnose my (still) dead blower?? Or, am I just SOL and must face the fact of blower motor replacement

kpb

[Tomguy]

Is the 108 blower a brush motor? If so, it's possible that it burned up when it was clogged. A brush motor needs to spin to prevent overheating poles on the rotor. If it stops, all the heat is concentrated on one pole and no air moving over it creates a large thermal breakdown of the (very thin) insulation on the wound wire. It becomes a huge short-circuit basically, and the wire blows out (usually close to the contacts).

I can rewind motors personally and would at least attempt it if I were you but if you don't know how, you are out a bit of $$$ for a new one.

If you try you MAY be able to take it to an electrical shop or send it somewhere to have them at least LOOK at it and possibly rewind any burned up poles.

[300SDog]

.......just one caution on fiddling with the motor - dont let anybody throw away the metal clips on the blades. These are ballance weights for smooth running and long life. Hell, if you rebuild your existing motor you might want to bench test it for ballance too..... possibly figuring out a way to perfectly ballance the blades if the motor gets thrown out of ballance in rebuild process.