2016 Hyunda Elantra *MYSTERY COOLANT LEAK?!* Need Help, This Question Forum is my LAST Shot of Getting an Answer!

Hi there! I currently have been dealing with my most annoying coolant leak imaginable. It doesn't seem like a massive issue (or maybe it is?), but I'll say for sure that it's a big stressor. Just for some history of the car... early this year I took my car from North Carolina to California and BACK! The tires needed to be completely changed. Ok... not so bad... A few months ago I took my car from North Carolina to Niagara Falls (Canada) and BACK! The alternator was replaced, alongside the battery. Upon arrival at Niagara Falls, we got STRANDED there as the engine seized! My 130,000-mile engine was replaced with an engine with 33,000 miles on it. Amazing, but... EXPENSIVE! I tell you this because I am now constantly paranoid about every tick, every sound, and every problem with my car. And I want answers to ensure that my car lives as long as possible. 

So on to the more up-to-date issue of the car... the coolant leak! There's not a massive puddle foaming out of the car as soon as I put in more coolant. Which... now I have 2 full bottles of coolant just in case I need it at any point. The problem is... it's a mystery coolant leak! So, at first, the coolant was losing about an inch of coolant every single day in the big coolant reservoir tank. The issue with that is it was annoying to constantly refill every week or so... but all of a sudden it had stopped? I did my attempts at troubleshooting the small problems, I replaced the radiator cap, I replaced the air filter, I looked around for any visible leaks, and nothing... until this last 2-3 weeks, all of a sudden my coolant reservoir tank is not moving at ALL, it's no longer leaking, but instead-- now where you pour in the coolant after taking the radiator cap off-- not the coolant reservoir tank, the radiator tank... now that's empty. I filled it up a few days ago, and now it's lower than before. I will say, after taking the radiator cap off and checking it, it's not completely bone dry, but it is very low compared to how much it was filled up. I was tempted to pour in some radiator stop leak, but I immediately stopped and decided to look up my issue, get answers, and think this through before doing some irreversible damage on accident like clogging the heater core, etc. 

Occasionally when I drive the car, I smell something sweet. And I know that's coolant... also after long drives, when I pop the hood open there is dried white stuff sprayed everywhere (dried coolant). Now when I say everywhere, I mean it's mainly splattered near the cooling fan; as if the coolant is dropping onto the fan, and the fan is splattering the coolant around that region. When the car isn't running, there is no sign of leakage (there was once, earlier on when troubleshooting this car, and I did actually use a coolant leak repair thing, and my car hasn't leaked coolant since). As of now, there is no sign of coolant leakage apart from when the car is running. 

I don't really know what to do apart from carrying on with my "detective work", and narrowing down what is wrong with the car. The car hasn't been overheating at all when driving, and the only thing I've noticed performance-wise is when I'm stopped at a stop sign or a red light-- the steering wheel can feel more vibration as opposed to when moving. (probably is normal, I don't know-- as I said, I'm just really paranoid about every tick, vibration, or sound my car makes now). And the last thing I can mention about this problem is that rarely, but something I can hear a water sloshing sound on the right-hand side. And that is all of the clues that I have and the symptoms that my car is having at the moment. 

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TLDR: coolant reservoir tank lost about an inch a day until eventually stopped, then the radiator cap tank starts losing coolant, smelling of something sweet (coolant) when driving sometimes, dried coolant sprayed all over the front part of the engine-- splatter maybe from dripping on the radiator fan. 

so far the car has a new: radiator fan, engine, engine start block, battery, alternator, tires, air filter, and radiator cap. (WHAT ELSE NEEDS CHANGING?! haha!)

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Thanks for reading and helping

Best regards,

Verticy.