I was about to comment also that removing the monovalve connector will, if the monovalve screen isn't torn badly, give heat, lots of heat if the pump is running, a little less if its off (even with the pump unplugged there is some coolant flow thru the heater, its just not nearly as much). So the test is defying the logical operation - I suggest running the test again. The Gr$#Frikiing monovalve works opposite to what you would think! power applied = shut

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!