coolant resovoir keeps going dry, no leaks anywhere on the motor. on 1995 Chevrolet 1500 Pickup

No trace of coolant in the oil, nothing leaking anywhere. You can fill the tank with antifreeze to the cold mark and 2 days later it is bone dry. Truck runs fine temperature is great, heater core not leaking, where is it going?

poss leak in plastic bottle is very common. do you ever have to add to coolant to radiator ?
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.
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1 more answer , 1 more comment
possible reservior leak?
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!!