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Etka lists the thermal fan switch part as VW part number 8D0 959 481 B, described as 95-84C/102-91C, 4 pin.
ECS Tuning has several parts listed under that part number, amongst them ES# 1873, a Meyle part, in stock.
 

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I think it is most likely a faulty temp switch.
But, if the chattering returns after you replace the temp switch, the A/C pressure switch would be next.
After that, the only possibility would be a fault in the wiring to one of those switches.
Good luck.
 
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