My TDI doesn't have a klima relay like device, neither does my mom's van or my sister's Pontiac (All of which are equipped with a serp belt, my sister's 3800 equipped Grand Prix actually uses the same belt as my SDL!). Not sayin it's a bad system, but IMHO it's a little over the top.

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.