Maybe your stat is sticking open.
You should have said lol in that case i dont know either
What's the year and maybe your VIN number? just ZZZ last three digits, will look it up on VW parts catalogue for you then.
If it's a 97 it's M10, only early models (<=94) had M14 for temperature switch.part no for white one: 026906161 (2-pin)black one: 049919501 (1-pin)