Engatwork,
I will check the aux. pump. Could it be the aux. pump even if I have the same temp heat at highway speeds AND at idle?

Leathermang,
I don't recall if there was a two temp stamped on the t-stat. I do remember seeing the brand BEHR and the MB emblem on it.

I can't work on it today, got church! I will try to check these things out tomorrow after I leave the office. I am still happy with the SD, at least that's what I am telling myself . I don't think I would have been happy with one that is perfect cause then I wouldn't get to tinker with my car and tinkering with my car is therapy for me.


Kevin