diff locking stays locked !

[Bernard Bousson <bernard.bousson@skynet.be>]

hy everybody, 

I'm new to this list and just bought an 86 coupe GT quattro 2,2l 5
cylinders, the car is running perfect but seems I've a problem with the
the front differential.

I've been playing with the diff switch before buying the car and
everything was functionning corectly, the front and rear diff engage and
disengage properly.

But now the front diff stays locked (the green light on the dashboard
keep burning and and you feel it also) I don't know what to do to
disengage it as the switch doesn't operate anymore. but this not the
switch because the rear engage and disengage like new.

Does anyone of you have any idea of the problem?
Is it dangerous to drive with the front diff locked?
Speed?
Did I broke everything already?

Thanks

Bernard