3 problems with 99 LS 4x4 4 door Blazer

first problem i am having and cant figure it out i have a brand new radiator, thermostat, and water pump but still my truck doesnt hold antifreeze or water for long. i put antifreeze in the radiator and the coolant tank and a month later its out again and the truck starts getting hot i put more antifreeze and it works the truck cools down. for a month or however long it stays good and runs great and then same thing again nobody can tell me whats wrong with it. it is not leaking that anybody can see i park in the same spot day after day and i would see the moisture on the ground or something and we checked it for leaks and if its leaking its not leaking out to the ground so i don't think its a leak. people keep trying to figure it out for me but i need to know I'm tired of wasting money on antifreeze for it to only last a little bit. what could be wrong with it?

Second problem, when i am driving and i turn hard i hear a pop coming from the tire area while straighting out the wheel after the turn. the way i can describe the noise is it sounds like a bone popping after stretching.what could this be?

third problem, is most of the time when i'm driving on the road most roads are really bumpy where i live and i hear what to me sounds like the back gate in the blazer and it squeaks like crazy. ive checked it and its closed tightly and everything but it only does it on bumpy roads. so could it be the suspension on the back causing this squeaking cuz it is bad the squeak drives me crazy on bumpy roads. what do you think could be the problem?

If it does not hold coolant you have a leak someplace unless it is running hot and blowing it out?

Any light blue or white smoke out tail pipe?
Is Engine running hot?
Good Rad cap?
Any coolant in engine oil?
Any cylinder miss stat up?
Any coolant leaks on coolant bottle or rad or heater core?

For the real hard to find leaks they make a coolant dye test fluid to put in coolant and watch for leaks.

Have you pressure tested it cold warm and hot and looked for leaks?

On the noise check all front parts for looseness and dry joints.
Also steering shafts sometimes pop and sometime drive shaft splines and u joints will pop if dry or worn out.

The intake manifold gasket is probably leaking in the back. Coolant runs down the back of the engine block and drips on to the exhaust manifold and burns, leaving no drips on the ground. As MT mentioned, add the dye and pressure test it, probably need a small mirror to spot the leak. It's also possible for the heater core to leak on the passenger floor, but I doubt that's the problem....you would have noticed a soaking wet carpet, a "sweet" smell inside the vehicle, and the windows would have a film on them.

The squeek in the rear might be the hatch glass latch. Unlatch the glass, put a hand towel over the latch and drive it. If the noise is gone, the latch needs to be lubricated and adjusted.