98 chevy 4.3l leaking coolant (not visible)and making tick noise on cold startup

What is your question?

i have been having to add about 1/2 pint of coolant in the resevoir daily. also when i start my truck up from cold (at least 4 hours from previous driving) it makes a low pitched "tick" noise some what of a "knock" is coolant leaking into a cylinder?? it doesnt puff white smoke. the oil on the dipstick looks good. could it be lifter noise?? P.S. the water pump was done about 20K ago. intake manifold gaskets around 15K ago (it did overheat at that time)