I have a 2000 GTI VR6. My coolant light came on & when I checked it, it was completely empty. I added coolant, but in less than 1/2 day, it was empty again. What could be the problem?

 

Welcome to the forum.

Well when you fill it up again and you can't see any obvious leak dripping on the floor it could be a few things. So you only have a coolant light not a gauge? If the gauge is going over to hot the impellor has fallen of the water pump or the cylinder head gasket could have blown.
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When I put more coolant in, it just leaks straight to the ground. It is completely empty in a few minutes and my coolant light comes back on. The temperature gauge does not change and my car is not overheating. It just smells like burnt coolant.

 

Well then its obvious you have a leak if it just runs on the ground investigate where its coming from?