Two Thermostats

[Johntheo1]

Can someone provide info on the above, one, in the main cooling circuit (sometimes called the Outer Circuit) openes at 87C and a example part number may be 04 E 121 113G, the second stat in the "small circuit" (Inner Circuit) seems to open at 97C, example part number 04 E 121 113N, what cooling circuits do they control?

[Johntheo1]

VW

All EA211 engines have separate cylinder block and cylinder head cooling circuits, wonder what alarm is flagged if the cylinder block stat should fail shut?, maybe a high oil temperature alarm?. If interested look up VW SSP 820333 pdf.

[Simonz]

Something new to me, not heard of two circuits before. Obviously a clever idea to get the engine up to temperature quickly, which it certainly does. Not too keen on the problems which might come up after 5+ years of ownership...