There are some similarities Steve! I just have to assume that the cooler is getting most of the flow instead of the heater matrix. There must be a pressure differential causing the hotter water to flow through the cooler. Even sat at tickover the transmission oil temp just climbs right up to 96 when the coolant temp leaving the head is at 101. If I can't improve the flow I'll modify the pipework and take a tee off the bottom hose and back to the expansion pipe after the EGR valve. Thanks .Well the transmission cooler is water to fluid so it is going to pretty much match and VW do have some odd ideas, if I tried to explain the engine oil delivery and cooling system on the EA111 based 1.4 TFSI it would make your head spin with its illogical layout.