yep i can confirm, had the same probs in my previous car, cos i removed the thermostat based on a friend's good idea that it would give me better cooling.
1) I couldn't get the heater to work properly & the engine temp drop really low at night and long drives
2) yes i did loose coolant and it kep coming out from the overflow. I thing the thermostate acts like a pressure valve also so that it keep the pressure inside the cooling system and stops it from overflowing.
These are both what i personally experienced. I then put a new OEM one in and it fixed all these problems
im losing coolant as well, not alot but it does accumulate over a week. i had in mind maybe the waterpump is on its way out but i'll most likely try replacing the thermostat before jumping into anything else.
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