Currently I am having the same problem. I have a 03' Beetle and the red temp. light just came on yesterday when it was 50 degress outside and the car was just started up. So I know it was not over-heating. I also tried to get it to heat up today, then I checked it with a temp. gun and it was steady 200-204.
It is still under warranty so I will take it in today and see what they have to say.
Also what specific sensor controls the light?
Thanks. . . . . . . . .
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