[mwebb]

Originally Posted by COcyclist

On the VW TDI is does help warm up times. The Exhaust Gas goes through a stainless steel EGR cooler which is tied into the coolant loop. As the exhaust gas is cooled it heats the coolant flow.

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i would have to check to see if the EGR is active
when cold

if EGR is not active until the engine has reached a certain temperature then the EGR cooler will have zero effect on warm up

remember
the primary function of EGR is to reduce NOX and NOX
does not can not form at low engine combustion temperatures
if active
EGR would NOT enhance the operation of a cold engine