It seems like every winter my k1500 plow truck with the 4.3l 6 cylinder engine and the 5 peed transmission gets air in the clutch hydraulic line. Doesn't seem to happen during the summer only when the winter comes and I need it to plow with. I have been able to get my pedal back by pumping the clutch pedal 125 to 200 times, but it's a pain. Any ideas of a way to eliminate this problem?