Coolant flush and filter install - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 10-08-2010, 07:33 AM Thread Starter
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Coolant flush and filter install

Just got my dieselsite filter, and plan on flushing the coolant then installing the filter this weekend.

Just curious if there are any negative effects with doing those at the same time. Should I install the filter let it clean the system for a few days then flush, should I flush then wait to install the filter? Or is it no big deal to do at the same time?

I know I am probably way overthinking this, but just curious if anyone has any advice on the topic.
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post #2 of 5 Old 10-08-2010, 08:02 AM
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Flush it then install the filter that's how I would do it


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post #3 of 5 Old 10-08-2010, 08:44 AM
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I just finished doing the same last week. I did all of the flushing (VC-9 followed by many interations of distilled water) prior to installing the filtering system. However, I couldn't get the final flushes to be clear until I installed the DieselSite filter system. Those final washes were grayish - like weak tea. I think there was some sort of sediment or something clinging to the coolant passages because once I installed the filter and drove for about 20 miles, it cleaned right up on the next (and final) flush.

So to come back to your question - do most/all of the flushing prior to installing the filter system.

I would also add that you do the install while you have the system drained, that way you won't make a mess or waste any new coolant. I cut into my coolant lines after draining out thru the stop**** and lower hose, so nothing spilled.

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post #4 of 5 Old 10-08-2010, 09:09 AM Fanatic
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I installed my coolant filter after the flushing. I also didnt bother with the distilled water until the final 4 flushes. I flushed with Restore and then VC9, after the VC9 I drained it into a bucket for a few flushes then ran the hose straight into the degas bottle with the motor running and the rad pet**** removed, I did this for 30 minutes and the water was totally clear. Then I did 4 flushes with distilled water on high idle for 5 minutes pulling the rad pet****, lower rad hose, and drivers side block plug after each one of them.
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post #5 of 5 Old 10-08-2010, 09:53 AM
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I had mine flushed first then installed the coolant by pass filter. I changed the filter after 5,000 miles and was amazed at the gunk trapped inside the filter.

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