thanks Tannaton, I was getting even more confused for a bit then, but I checked VIDA and it seems that there are two systems - pump part number 9169611 which has one outlet and therefore 2 pumps and part number 31349228 which has 2 outlets which operate with a small valve...I gather the motor spins both ways depending on front or rear to actuate the valve. Mine is the second type so still none the wiser.
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