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Coolant flush D 60
In the old days 1960’s when we flushed an engine for coolant change we removed the thermostat and removed the return hose and ran the engine with a supply of fresh water into the radiator until fresh water ran out of the top hose,
Is that a way to flush a D 60 in a 1998 /
How do I insure the recirculating front heater systems are fully clean
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1 Reply
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I am assuming you do not have OTR or a Webasto. Generally speaking you can open the 2 drain valves that are under the coolant lines to the lower left of the engine.
You will get most, but not all the coolant out. Some or all the coolant in the Aqua Hot heat exchanger and the front heater core may remain. As a percentage of the total cooling system volume it is very small, my guess being well under 10%.
Refill and bring the system up to temperature to assure it is circulating through the heater core and the AquaHot, and when you drain the second time only trace amounts of the coolant will remain.
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