On a recent trip, I found that my vent/AC fan only ran on 4. I pretty much always have it on 4 because AC. I do want it to work, so I removed the resistor and found that the electrical plug was really crusty. I cleaned all the spades and put some dielectric grease on it and put it back. Now the fan blows hard on 4. Alittle less on 3. Less than that on 2, but it doesn't blow at all on 1 or 0.
I assume it shouldn't blow on 0, but what about 1? My friend said that 0 shuts the vent door and 1 opens it, but doesn't run the motor. (You will get air if the car is moving.) He said all you have is three speeds for the fan. (2,3,4)
I can live with this. I probably never use 1 anyways, but I want to fix it if it's broke. Is that how they all work?