Replaced water pump; still loosing coolant

[four]

some of you might remember my post a few weeks ago. i replaced my water pump because i thought the sealant was out because it was leaking from the water pump. therefore went to courtesyparts.com and purchased a water pump.

after yesterday, the car started. 1 minute later, the fan turned on. that's how i knew that the car's temperature will go higher than usual. so i drove it around, then it got really high. i didnt turn it off, thus i just pulled over, let it run. the fan still aint turn off.

then i turn the car off, let it sit for like 15 minutes, re-filled the coolant resevoir tank, turned it on. then the car was running fine. fan didnt turn on indicating it was about to over heat. so i'm saying to myself "maybe the car just needed more coolant cuz there wasnt enough" So i let it sit over night thinking everything was fine.

This morning, i turn the car on, and check the coolant level. Well guess what? Coolant is low. at the minimum level. re-filled with some coolant again, then the fan turns on. (indicating temp. will get hot). so i was like f**k it, im gona drive it to work like this. when i got to work, car was fine. no over heating. up to now, i still think (and hope) i just need to add a little more coolant.

on my lunch break, i will buy some more coolant to put in there. i dont understand what's going wrong though. new water pump, new thermostat, new belts, and new coolant.

does it sound like im lacking coolant? i hope so. what do you guys think. thanks in advance