should there be any liquid in the plastic coolant bottle? on 1999 Chevrolet Suburban 1500

When I was checking the oil in my 1999 suburban I noticed that there was no liquid in the plastic coolant bottle.

2 answers
There should be, unless it had leaked or has been drawn into the radiator as it should if the cooling system is low. Fill it back to the fill line.
have cooling system pressure test to determine source of leak. could also be cracked plastic bottle or radiator cap issue