Flush before or after? That is the question. - Ford Powerstroke Diesel Forum
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Old 11-13-2012, 05:51 AM
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Flush before or after? That is the question.

I am replacing my oil cooler this weekend, and was wondering do i flush before i replace the new one....with the old one in place yet? Or do I flush after, risking what I think would be contaminating the new one?
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Old 11-13-2012, 06:10 AM
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Before. Your thinking is correct. Flush after and risk turning loose a bunch of crap into your brand new cooler.
Preferably put a coolant filter on for a few thousand miles beforehand.
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Old 11-13-2012, 06:10 AM
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Before. Its better to run a coolant filter for a few thousand miles before the flush though...if possible. If you flush after you replace it tou would probably clog the new one.

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Old 11-13-2012, 06:18 AM
War is the answer!


 

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Quote:
Originally Posted by JIM_C View Post
Before. Your thinking is correct. Flush after and risk turning loose a bunch of crap into your brand new cooler.
Preferably put a coolant filter on for a few thousand miles beforehand.
Copy cat

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Old 11-13-2012, 06:48 AM
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Thanks for the help guys...I appreciate it a bunch.
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Old 11-13-2012, 07:23 AM
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Quote:
Originally Posted by WarChild View Post
Copy cat

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No, YUR a copy cat!
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Old 11-13-2012, 07:33 AM
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Well I was thinking what both of you said you You're ALL copycats

OP, Yes I would do it before swapping coolers. Don't take the chance of ruining your new one. a couple thousand miles is good to have but not everyone has that option. (if the cooler is plugging bad and might rupture EGR cooler)
Atleast drive it a couple days-a week to get some coolant flow through the engine
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