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Old June 20th, 2018, 15:15   #102
forrest resto`s
Veteran Member
Join Date: Jul 2007
Location: athens ga.

Originally Posted by 93celicaconv View Post
FWIW, somewhere in this forum there was a VW Service Bulletin on these 2010-2014 2.0L TDI models with heater core plugging, and the point of the service bulletin was to clear spell out the process associated with flushing the entire cooling system with the old heater core remove and before the new one being installed, to ensure all other aspects of the cooling system had the residual assembly flux (used to join aluminum cores to tanks) and corrosion debris (aluminum oxide caused by the flux decaying the coolant corrosion inhibitors much quicker than the normal 2-3 year coolant change duty cycle) to avoid the potential of a repeat heater core plugging issue and another heater core replacement.

I say this because it may be possible the dealership did change your heater core, but didn't follow the VW service bulletin, so your system still had debris in it the quickly clogged your new core. Not saying this is certainly what happened, but I can see this possibility fitting your situation.
That makes alot of sense!..very good info..for others to pursue when replacing the h.c...
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