I think I mentioned this in your other topic, but I had a very similar problem w/my GTI. It sat for the better part of a year before I bought it so maybe if your car was sitting for a long time as well it might be suffering from the same problem. If you have ruled out the fan switch, and the fan itself is operational, then the problem is most likely either:
a) bad relay
b) bad fan motor
In my case, the fan would come on briefly, then shut off a few seconds later. I replaced the fan switch twice with no luck. Next I replaced the relay, still no luck. The fan fuse also was blowing intermittently, so I kept replacing that. Eventually I figured the fan motor was drawing too much power, this turned out to be correct, it was drawing something like 45 amps on a 30-amp circuit, so every time it would try to turn on, it would blow the fuse and shut off. Replaced the fan/motor assembly with one that tested out to 9 amps and it has worked flawlessly since then.
So, cliff notes version, check fuses, check relay, check fan motor itself.
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