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Old May 26th, 2020, 07:46   #8
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Join Date: Mar 2005
Location: Back in So Flo - St Lucie

Originally Posted by GMCJETPILOT
There is a market for an aftermarket radiator with a drain plug at the bottom....
No there is NOT. The cooling system is an incredibly complex maze of hose, pipes, coolers, valves, thermostats, pumps, and heat exchangers on a modern TDI. A drain on the radiator is going to miss A LOT of the cooling system, and the debris therein.

Only way you are getting 100% flush involves the engine basically down to a long block, and most of the engine bay spread out over a shop floor where you then proceed to use a hose to flush water through everything.

I had a customer think the blue coolant cap was the AdBlue cap on a 2010 Golf. Many flushes later the system still had DEF in it. That's the point when we did ^^ and managed to get it clean enough. Though I did suggest much more frequent coolant inspection and change schedule.


PS: I think the "drain and fill" is a good idea on a regular basis to keep fresh coolant (and its additives) in the system. Which is the point of the vacuum "flush" device.
VW and ASE Master Mechanic. Means nothing without the 15+years working at VW. Also know my way around an aircooled 34 pict 3 or Bosch D-jet.
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