Now she blows cold on both Red /Blue settings Is it the 500.00 Duo valve? on Driver side under front cover? I just had a Coolant Flush with New T STAT. Runs at 80-90 Celsius . AC is Ice cold. Local Euro Repair shops are useless. It doesn't seem to be a difficult install, Just $$$ tho. :

I would say yes, that it's a failed motor on the duovalve, but I would check voltage at that valve before replacing it.

There were a couple of W140's come to the JY recently, I should have grabbed the duovalves, but I didn't.

Steve

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Steve A
92 W140 OM603
97 VW Jetta TDI
90 Passat variant TDI 6 speed MT
94 Chevy K1500 6.5TD
05 E320 CDI
+ others

That's what I thought..