my power window won't slide down. one on the passanger side does fine. when pressed down, switch starts making clicking noise, like as if a relay is going on-off. i removed the switch, cleaned contacts, lubed contacts - same result. this happened about a week ago, then problem went away all by itself. now it's back. i can replace anything in it by myself, just need to know what to. sounds like motor gone bad, or maybe lose contact and relay just kicks back. please, help with advice. 2000 silverado 1500 ext. cab. thank you PS: on the same token, does anyone know how to unstuck a stuck window? i went through car repair manual, it says that window motor has a safety feature preventing it from burning if it takes too much effor to move the window. which that window was going down easy but squeeky slowly up before. now it starts sounding like the click is coming from that safety switch. looks like door to be disassembled over the weekend and guides cleaned and lubed.