SOURCE: Coolant warning lights keeps coming on
Audi TT's only take G12 coolant (vw/audi propriatary formula) you can add some distilled water to the water level to prevent the light from coming on, but as you explained you keep adding fluid (of some kind) and the warning like returns. that's a little evident that you have a leak somewhere.
put some paper towels or something under your car when you park it for the evening. when you come out the next day, pull the car away from the spot and look at the paper towels. if they have orange drops, that's your G12 coolant leaking. like McMuff460 said, check all the clamps/hoses for signs of the leak. if you don't find anything i reccomend taking it to a shop for them to check out. Your water pump might be on it's way out.
Don't ever put any other fluid other than G12 coolant and distilled water into your car's coolant system. It will cause some major issues with seals, leaks, and cooling performance.
SOURCE: I keep having to refill my coolant tank what do i need to do
CHECK YOUR oil and see if it is milky there have been some issues with heads cracking on these. another option is to have dye added to cooling system and drive a few days then have checked with a blacklight the dye will glow this can help spot a small leak
SOURCE: coolant leak 1998 buick external
it sounds like the water pump may be leaking beacuse when runnung the seal is lubricated and may not be leaking at that time but when left over night the seal in the water pump contract and starts to leak. check for stains and leaks with a mirror before starting in the morning i think you will find that it is leaking. don't worry they are not bad to change. good luck
SOURCE: Indicator Light Indicate the Coolant Level is Low
either you have a hole in your coolant tank or the gasket in the radiator cap is bad or you have a small leak in your radiator or your car is getting hot those are the most common problems you can look for because it can be a lot more problems that can be add to this list but those here are the most common problems so look for one of this problem
SOURCE: 1997 Saturn SL2 Coolant Leak
you would have a water pump problem at a guess, does the water come from under the front of the engine?if so that is what it will be
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