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Old May 30th, 2020, 21:24   #10
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Join Date: Aug 2008
Location: Memphis TN

Originally Posted by SilverGhost View Post
I flush a TDI cooling system by removing the passenger radiator hose and BOTH intercooler hoses (Passat and 15 TDI) OR the oil cooler hose. Put hose in the top intercooler pipe and wait for clean water at lower pipe, continue for 5 minutes. Repeat on radiator hose. Then park the car over a drain and let it idle for at least 45 minutes, sometimes longer, with a hose in the reservoir and both lower hoses off (sometimes prop intercooler hose against intercooler pipe to slow water flow so it comes out radiator as well).Jason
You are flushing with tap water? Then you run it with hose's off? Hummm. Tap water is no good due to mineral deposits. Running open unpressurized system could result in parts of system with air, resulting uneven cooling that could damage engine.

Originally Posted by SilverGhost View Post
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.
As far as a radiator with drain like most other VW's, you say no good because you won't get debris out? What debris? The debris is small and in solution. Repeat drain and fill would rid the system of debris as you call it. Second if VW move the lower radiator hose to bottom of radiator it would help.

Last edited by gmcjetpilot; May 30th, 2020 at 21:53.
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