W108 heater sliders help needed

[merc280]

i could sure use a little help understanding how the heater slider switches work in my 1973 280SEL 4.5. I figured out the obvious, like the car heats up when the sliders are moved to the red triangular position, and defrost supposedly shoots air up to the windshield, but without a heater blower fan (it's inoperable) I can't be sure how things are supposed to work. Can someone with similar vehicle explain? I've attached a photograph. Thanks much. By the way, I've owned the car for 13 years but have driven it only sparingly in that time. thank you.

[Tomguy]

See the "Defrost" thing? That shows how to get max defrost - max heat, max fan, all air blowing up.

Top left = fan speed, all the way left = fastest
Bottom left = Driver's heat, all the way left = valve and flap fully open
Top right = Air flow, all the way right = down, all the way left = up
Bottom right = Passenger heat, all the way right = valve and flap fully open

[merc280]

thank you this is exactly what i wanted. now i just need to consider if i want to replace the blower fan; ive heard the stories about that job.

[Tomguy]

Spin it by hand and then try to turn it on, maybe you'll get lucky and it's just blocked with leaves or something

[merc280]

thanks, will try that - the car was sitting for a long time, including a spell outside for a while, so perhaps I will find something simple. just have to ask, however, is the motor accessible from under the hood or will i have to go through hoops to just try to spin it?

[Tomguy]

You may need to pull the cowl guard but then you should be able to get a visual and a wire coat hanger down in there to spin it.