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Old April 27th, 2018, 04:18   #14
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Join Date: Dec 2001
Location: St Louis
Fuel Economy: fantastic

Originally Posted by gloaming View Post
Well you're both right. HP and LP EGR

My thoughts are along the line of some type of liquid cooling somewhere in the exhaust stream.

All TDIs sold here since 1997 have had liquid cooled EGR. The newer engines employ some very complex cooling system circuits, dual thermostats, additional pumps, etc., to help both get the engine up to temp quickly as well as keep it there. But exhaust temp is very important too, and to pump coolant through the hot parts of the exhaust (as some hybrid gasoline cars do) would help keep the engine warm, but would be detrimental in their cooling effects on the exhaust components that need to be very hot in order to function properly.
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