Inlet or outlet on heater core ?

[Poooobaa]

I can't seem to find a good pic of which pipe is the inlet for my 1991 m42. Is it the lower or the upper one? Thanks for your help. Which hooks up where?

[Vladi]

http://www.m42club.com/forums/showthread.php?t=4865

[Poooobaa]

Thanks Vladi. I found the two pics you reference but was still unclear as to upper or lower nipple for the inlet.