Coolant Flush questions - Ford Powerstroke Diesel Forum
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Old 02-08-2014, 08:25 AM Rookie

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Coolant Flush questions

06 with 163k bought it 2 months ago. And have spent that time getting the truck to my standards it was a well dressed basket case, that I have pretty much straightened out. I played the 6.0 lottery and seem so far to have done well knock on wood. I did have a coolant leak as the coolant was low and would sometimes leave a small amount on the ground after driving. This is not an everyday vehicle so I took sometime getting around to the coolant problem for fear of an oil cooler problem. After installing my sgii my deltas are 4-10° different and the coolant lose was due to a hole rubbed in the hose that runs from the degas bottle to the intake, the turbo had rubbed a pin hole that would leak as coolant heated it. While replacing the hose I found when the radiator had been replaced by the previous owner it had been filled with regular green coolant. I want to switch to an elc and get this crap out before I really start towing and using the new found power of my innovative diesel tuner. I want to flush with restore and vc-9, but fear plugging the oil cooler should I just flush with distilled and fill with elc since my deltas seem to be fine? I want to delete the egr eventually but not at the moment. But I need to add coolant due to the leak. I guess the question is could I add some more green to refill and run it until I got ready to delete egr and flush? Thanks for reading
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Old 02-08-2014, 09:44 AM
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There is always a strong chance of plugging up a new oil cooler when flushing after the install especially useing one of the chemical flushes it breaks down the material actually causeing the problem, it breaks loose and can wind up clogging the new cooler.

As for the color of the coolant that doesn't matter it is the formulation. As long as it is rated for diesels you can use it.
That said I do know of a few people who use regular automotive coolant for years with no apparent ill effects. So I dunno is the industry standards truth or just sales promotion?
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Old 02-09-2014, 09:48 AM Rookie

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I have checked alot of posts regarding flushing the coolant and which particular coolant to use. I had replaced my EGR cooler with the upgraded "guts" so I wasn't concerned about it getting clogged when I used the VC-9. I used 2 quarts (about $25 ea) and bought ALOT of distilled water. I went through at least 16 gallons because my coolant system was rust colored. I didn't removed the thermostat but I did drain from the drivers side engine plug. The correct way, from what I read, is to remove the thermostat as well as the left and right engine drain plug. The starter needs to be removed (unless you have the special tool) to get to the passengers drain plug. I filled up with NAPA Zerex G05 undiluted and the remaining distilled water to get the 50/50.
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