Good question.

Doesn't the front pump get it's power from the TC input?

I'm also not sure about the flow rate, it seemed somewhat weak.

Should it be pumping 2 quarts per minute or so? Does it always get pumped to the cooler? Would the fact that it's in the teens temperature wise change anything?

Bottom line is that I need to get it apart.

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1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?