MY RADIATOR FLUID KEEPS DROPPING?

I HAVE A 99 LUMINA WITH 130,000 MI ON IT... THE RADIATOR FLUID KEEPS NEEDING TO BE REFILLED. IS THIS COMMON AMONG CHEVYS AND WHAT COULD BE POSSIBLE PROBLEMS AND APPROXIMATE REPAIR COST?MY RADIATOR FLUID KEEPS DROPPING?
possible you have a leak either in the radiator or the water pump. also you could have leak in the intake manifold or head gasket. Can have radiator and water pump pressure tested to see if that is the problem. Just have to look and do some tests. could be a simple fix if you are lucky. Have you ever flushed and drained the coolant system. also check hoses if feel soft and spongy they may need replacing. try a can of stop leak to see if that solves your problem. any auto parts store can help you.MY RADIATOR FLUID KEEPS DROPPING?
My first guess is that one of your radiator hoses has a leak or the rad its self has a leak. Both are easy fixes and can be done at home.MY RADIATOR FLUID KEEPS DROPPING?
Could also be a bad thermostat or water pump. Other than those main areas there are still many smaller areas that run along the radiator fluid track in the motor which would require taking into a shop to have them find it.MY RADIATOR FLUID KEEPS DROPPING?
first thing to do is pressure test cooling system not forgetting the heater matrix test from cold to hot if ok might be the start of a head gasket also check the seal on rad cap
you could have the heater core leaking on the floor, a head gasket leaking, the reservoir leaking or the radiator. maybe a hose.