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Old May 26th, 2020, 07:54   #9
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Join Date: Mar 2005
Location: Back in So Flo - St Lucie

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).

Two thirds of the time that works to clear the system out when the heater core has been plugged. Rest of the time we parts warranty a heater core when it comes back again. Repeat the flush regime again.

Like I implied - not an easy engine to flush the coolant.

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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