Yup and it was me and it's still working fine a good few months later
Here is the thread:
http://www.vectra-c.com/forum/showthread.php?t=56294
From your symptoms it sounds like it could be relay K5 - that's if it is a relay fault. That's the one that sends current straight to the motor. If your internal fan motor is on full pelt (i.e. position 4 speed) then it is almost certainly this.
If it isn't that then something must have caused the relay to close - i.e a switch - which to me suggests it could be a fault or stuck switch with the control unit itself.
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