coolant resovoir keeps going dry, no leaks anywhere on the motor.

nope no coolant to radiator. nothing wet anywhere.

poss its coming out of rad overflow while your driving. how old is the rad cap,maybe repl and see if that helps

I have a 1995 Z71 regular cab 5.7l. same problem. Same symptoms. No visible leaks.

Hi i have a 1998 Chevy 1500 4.3 V6 its got 127xxx miles it recently started having the same symptoms as listed above (resevoir drains, No visible leaks, oil looks good ON DIPSTICK etc.) except now when i start it up from cold (around 30-40 degrees outside temp) it makes a low pitched "ticking" sound under the hood my friend said its lifter noise and not to worry about as it doesnt puff out white smoke anywhere but i need too get it figured out before the snow flies in about 2 weeks. Thanks!!