Blower/Compressor Control Problem (2002 VW Cabrio)

Hi,

This is my first post, so excuse any naivete on my part here.

I have a 2002 VW Cabrio. A n annoying problem recently developed with the blower/compressor control. The blower no longer works when the fan switch is set to speeds 1, 2, and 3. And the compressor doesn't work when the fan switch is at 4.

Let me describe that again... When the A/C button is in the "ON" position (i.e. pressed in) and the fan switch is on setting 1-3, the compressor is running (the engine dips and I can hear the compressor running) but the blower does not run. When the fan switch is on setting 4, the compressor turns off and blower turns on.

What could be the problem here? Could it be a relay switch? Which one? Where are they located? Does anyone have a map available?

I found another post that seems to describe a related, but not identical problem (and that was a 1990 Golf -- so maybe it's not applicable...although I believe late model Cabrios are very similar to Golfs of the early 90s)

The last post in that thread makes me thing maybe the main feed to the relay has been disconnected? But how do I check this? I have never worked on the electrical system on a car before and I don't have a Haynes or Bentley manual for this car yet, so the more explanation responders can provide the better...

Thanks so much for any help anyone can offer!

Jennifer