I have a 2000 VW Beetle and the temp gauge recently started coming on, flashing red and beeping, but it is not overheating. Sometimes it comes on right after I start my car, and sometimes after I have been driving it for 10 min or so. I took it to the shop and they flushed out the whole cooling system and said that everything was fine; no leaks or anything and fans running properly. They simply said they didn't know the problem and I should take it to the dealer. Does anyone know what the problem might be? I don't want to be stuck with a huge bill from the vw dealership... help!