Richard- is it trying to move or not? If not, could be either the switch or motor. If it's trying to move but sticking, try spraying silicone spray (NOT WD-40 or anything else with a petroleum base!) in the guides at the front & rear edges of the glass. Sometimes the glass run channels become sticky in cold and/or wet weather. HTH
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Bill Lins Wharton, TX 98 2500 QC SLT,12 (the CORRECT # of)valves,NV4500,3. 54 LSD,Manik grille guard,Semi-Psychotty Air,Amsoil everywhere, Reading aluminum utility body and bumper,Optima yellow tops- silencer ring & muffler stolen.