My 2000 audi 2.7t was overheating when i wasgonna pull over to stop the thermostat whent back down to normal but the overheating light was still on. another thing was i checked the antifreeze and it was full but when i got home it was all gone. i found no signs of leaking. please help with what it might be

Hello, trfrost621 and thank you for asking your question on Fixya!

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 2000 Audi A6, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose your overheating 2000 Audi A6

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Thanks for the vote, and good luck!