It either doesn't work at all for all four speeds or it works for all four speeds. Because of that behavior it makes me pretty sure that it is not the fan speed controller (although I could be wrong).
Here are some tests that I ran. What I did was try turning on the car but not starting the motor and seeing if the blower would work. I then tried it by turning to the On position, testing blower, then turning motor on, then testing blower. Here are the results:
(1) Turn to On - Blower didn't work.
(2) Turn to On - Blower didn't work.
(3) Turn to On - Blower worked.
(4) Turn to On - Blower worked, Turned motor on - Blower didn't work
(5) Turn to On - Blower worked, Turned motor on - Blower didn't work
(6) Turn to On - Blower worked, Turned motor on - Blower worked
(7) Turn to On - Blower worked, Turned motor on - Blower didn't work
(8) Turn to On - Blower worked, Turned motor on - Blower didn't work
I did all of the above tests sitting in my garage. The interesting thing is that the blower didn't work the first two times just turning to the On position in the ignition but the 3rd time did. Also after it started working it worked every time therafter in the ON position but did not always work once the motor was running. Very Odd. I am really stumped on this one now. Anyone have any thoughts or suggestions? Anyone have a HELMS manual that can scan the pages for the blower fan or that can walk me through the debugging via email?
Thanks,
John