Success!!! I pulled the Aux water pump (mine right next to the monovalve on the same plastic assembly). There was three torx? screws holding it in place and took just a few minutes to remove (magnetic bit helps with the third screw against the firewall). Based on the pics Compress supplied and a little guess work I was able to take it apart and clean it out. Before I took it apart, the pump maybe started up once every 15 taps. After cleaning all the crud out (black dust from the magnet and brushes) it work every time I gave it current...also it ran ALOT stronger too! I suspect the two spring loaded brushes were not sliding very well or stuck in the little track from all the black dust. I took some pics...sorry it was 15 deg outside so I was in a rush...I'm whimpy. Hardest part was to get the two spring loaded brushes pulled back so to could get the motor between them....I used sewing thread to pull both springs back while I positioned motor? between the brushes.

I took it for a test spin ..the heat from the vents came in toasty in just 5-7 min of freeway driving (engine temp at 79-80c) and at idle....just as toasty! Success! Dare I say the cabin vents heat up faster than I can remember.

Thanks MBDOC and Ph2Cho for pointing out the aux pump and Compress for the ideas.

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