I'm a believer in VC-9 look at this pic - Page 2 - Diesel Forum - TheDieselStop.com
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Go Back   Diesel Forum - TheDieselStop.com > 1999-2007 Ford Super Duties > 6.0L Power Stroke Engine and Drivetrain

6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

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Old 04-07-2010, 07:00 PM   #16 (permalink)
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my local dealer wanted something like $35 per bottle of vc-9
here a better price
Motorcraft diesel engine coolant system iron cleaner VC9
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Old 04-07-2010, 09:09 PM   #17 (permalink)
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I think I paid about $26 at my dealer. Also I used 2 quarts, I think it said not to use more than a 10% ratio so I figured since the coolant capacity is 27 1/2 quarts that 2 quarts would still be under the 10%. If you are flushing make sure to remove the block plug on the drivers side to remove about another gallon when draining. If you don't remove the block plug you will only get about 3 1/2 gallons by draining the radiator and removing the lower hose. To get the 50/50 mix you need to add 13 3/4 quarts of coolant so if you don't remove the block plug you may have trouble getting enough straight coolant in the system. The block plug takes an 8MM hex.
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Old 04-08-2010, 12:21 AM   #18 (permalink)
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I think I paid about $26 at my dealer. Also I used 2 quarts, I think it said not to use more than a 10% ratio so I figured since the coolant capacity is 27 1/2 quarts that 2 quarts would still be under the 10%. If you are flushing make sure to remove the block plug on the drivers side to remove about another gallon when draining. If you don't remove the block plug you will only get about 3 1/2 gallons by draining the radiator and removing the lower hose. To get the 50/50 mix you need to add 13 3/4 quarts of coolant so if you don't remove the block plug you may have trouble getting enough straight coolant in the system. The block plug takes an 8MM hex.
Thanks Guys.
Where is the block plug exactly located?
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Old 04-08-2010, 10:43 AM   #19 (permalink)
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One on each side of the engine. Passenger side is behind the starter. You do not need to pull this one if you flush four or five times. The water will be clean. I went thru approx. 20 gals. of distilled water doing mine. Smart & Final has 2 1/2 gal. jugs for $1.99 ea.
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Old 04-08-2010, 06:00 PM   #20 (permalink)
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Ok I have to ask the stupid question...How do you refill the radiator?
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Old 04-08-2010, 06:09 PM   #21 (permalink)
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Cap on the degas bottle!
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Old 04-09-2010, 10:25 AM   #22 (permalink)
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VC-9 does a great job. I use it at the dealer after an oil cooler failure because it is about the only thing ive found to get all of the oil out of the cooling system. definetly recommend innstalling a coolant filter as well.
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Old 04-24-2010, 05:23 PM   #23 (permalink)
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After reading about all the things I have to do to my truck I am going to be busy. I have to ask....where do you purchase a coolant filter ? Thanks for the good info.
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Old 04-24-2010, 06:02 PM   #24 (permalink)
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It's been mentioned before to remove the t-stat to speed up the flushing process, but then usually stated to reinstall the t-stat when done. Why wouldn't you want to just replace the t-stat? I know on prior gas engines I've owned, when changing coolant, I would replace the t-stat with a fresh one. Could someone explain this to me please. Should I replace the t-stat when I flush my coolant?

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Old 04-24-2010, 08:22 PM   #25 (permalink)
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D..WAG on replacing t stat. is, its out/stick a new one in unless something obviously wrong with it. Its fairly easy to check out how T. works using boiling water/thermo., but probably not done anymore. JMO!
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Old 04-24-2010, 08:33 PM   #26 (permalink)
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My drain after the vc9 was no where near that dark, and i drove it on the interstate for 57 miles before i drained it.
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Old 04-25-2010, 06:22 AM   #27 (permalink)
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........ Should I replace the t-stat when I flush my coolant?

Doug
That's up to you. There is not reason not to, nor is there one to replace a good operating one. Your call.
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Old 05-04-2010, 08:56 PM   #28 (permalink)
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Do you guys have a preference on the type of coolant?
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Old 05-04-2010, 09:45 PM   #29 (permalink)
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Ford premium gold or Zerex GO-5 only.
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Old 05-04-2010, 10:32 PM   #30 (permalink)
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Just flushed my 02 and changed the t-stat at the same time. No reason to not to if you have kinda miles on the truck. Mine has 180k.
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