Colin Shepherd

Vincent,
My late lamented 340 had the power window problem so I took the motor out and stripped it down. The only thing wrong with it was the overloadcut out in one of the wires to the brushes not reset itself
so I by-passed it and the motor worked for another 4 years.
I think its function is to liimit the force which is applied to the glass to prevent amputation of children`s heads, fingers etc.
As to the sunroof, on the larger Volvos(and I think yours is the same) you can easily fit a manual crank in place of the motor and gear box simply by undoing a few screws. You should be able to find a manual crank in the scrap yards. It will be a lot easier to find than an electric one.
Colin