XrayPipeliner
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Irate Diesel system it's a Walbro gsl392
http://forums.tdiclub.com/showthread.php?t=9135
Exhaust gasses re-route from the exhaust into the intake, heating up the intake charge. Coolant flows thru the EGR cooler, which dissipates heat from the EGR valve, which is in direct contact with the exhaust gasses; thus heating up the coolant.