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Old 09-10-2021, 01:21 PM   #1
Scooby Newbie
Member#: 526173
Join Date: Aug 2021
Default Cleaning coolant components

Pulled a seized engine to replace. And parts of the coolant system you could normal carryover to the newer engine are caked with orange residue. Water pipe, rubber hoses, heater, reservoir, etc.

Is it from oem Subaru coolant? Or maybe rust from improper coolant mixture.
This vehicle is new to me. Nor do I have any Subaru experience. Engine was refreshed 2 yrs ago. But could've been sitting a period after seizing.

I'd like to start with a fresh system on the fresh swap. I've read soda blast or vinegar (depending on application) can be used to clean.
But before buying product or put time in... To what degree do these remedies work? How do I get at the heater core? Am I stuck buying new parts if I want 'fresh'?
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Old Today, 02:55 AM   #2
Scooby Newbie
Member#: 158767
Join Date: Sep 2007
Location: az, mt, seoul, bangkok

sounds like the subi may have been running with a blown head gasket for a while leading to destruction of the cooling system components. You may be able to re use some parts after cleaning but i'd consider replacing everything possible to avoid annoying headaches in the future.
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Old Today, 08:49 AM   #3
Elbert Bass
Scooby Specialist
Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
2016 Fuji Sunfire 03


Depending on year/model Subaru specified and used Green and now Blue coolant. Orange sounds like some idiot used Dex-Cool. That stuff does not play well with others. Get to scrubbing an washing.
I have never had the pleasure but I am sure a Google search "flushing out Dex-Cool" will give you plenty of information. Seems that a de-scaling flush would get the job done with scrubbing out the caked on crud.

Hopefully it didn't gell up and clog the heater core and radiator - then that might be what caused the head gasket issue - the heater core is the bypass when the thermostat is closed. Clogged heater core - no coolant flow when thermostat is closed.
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