'83

I don't know what normal operation is because I've never seen it, hence the question.

The fresh air blower switch has four positions: 0 I II III

None worked, I took the plastic cover off the blower and shot Deoxit into the windings and give it a little push with a screwdriver, and got positions II and III to work.

So it worked on high and one step down from high.

After about another hour or two on the engine (not in a row, but 15 minutes here and there, idling mostly in the driveway while I worked on other things) position I started to work too.

So right now, 0 is off, I is really low, II is higher, and III is wide open.

Here's my knuckled headed question.

Is 0 off (like logic suggests) or is the blower supposed to be on even in the 0 position?

Thanks!
Keith

Actually, the blower fan does operate at a minimum speed when the vent switch is turned off. This allows for some constant cabin air cycling.

Have you checked the fan resistor? Look for corrosion/damage at the connections or the unit itself.

That "off" setting isn't really off.  It's a carbon monoxide safety issue.  Cars are required to always have some fresh air flow into the cabin when the car is on.