2002 s-10 ex cab, 2-whl dr , 4.3 . driver side power window system w- auto down

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Hi all, Im Jon and have a question. key on accy, window went down as ususal, aprox 15 mins later I hit the switch for up and got no respons, even after a few bonks on the door and many switch presses the window wouldnt go up!.so at the end of the work day I start the truck and prepair for a cold ride home, i hit the button for the heck of it and up went the window???,does anyone know if there is a thermal type relay built into the switch assy? as it usually clicks when the window gets all the way down!, Jon???