Coolant flush and fill
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New User
Joined: Oct 2019
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Coolant flush and fill
Anyone have a good writeup for a coolant flush and fill on a 2017 6.7? Doing both primary and secondary and having trouble finding much info. Also, does the yellow coolant still need an additive? Tia
Fleet Mechanic
Joined: Feb 2018
Posts: 1,592
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I did it. As you might expect, it's really hard to get everything drained.
For the primary: I drained the radiator stopcock and took off the hose to the oil cooler (drivers side). Drained completely. Added distilled water until full, drove till warm (maybe 15 minutes), stopped and drained. Repeated for a total of FOUR times until the coolant drained was essentially clear. After last drain, added back concentrate to 1/2 of the stated capacity and then topped off with distilled water.
For the secondary: Same thing but only drain was secondary radiator stopcock. Same four drain/refill cycles to get to clear water.
For the primary: I drained the radiator stopcock and took off the hose to the oil cooler (drivers side). Drained completely. Added distilled water until full, drove till warm (maybe 15 minutes), stopped and drained. Repeated for a total of FOUR times until the coolant drained was essentially clear. After last drain, added back concentrate to 1/2 of the stated capacity and then topped off with distilled water.
For the secondary: Same thing but only drain was secondary radiator stopcock. Same four drain/refill cycles to get to clear water.
Thread Starter
|
New User
Joined: Oct 2019
Posts: 23
Likes: 1
I did it. As you might expect, it's really hard to get everything drained.
For the primary: I drained the radiator stopcock and took off the hose to the oil cooler (drivers side). Drained completely. Added distilled water until full, drove till warm (maybe 15 minutes), stopped and drained. Repeated for a total of FOUR times until the coolant drained was essentially clear. After last drain, added back concentrate to 1/2 of the stated capacity and then topped off with distilled water.
For the secondary: Same thing but only drain was secondary radiator stopcock. Same four drain/refill cycles to get to clear water.
For the primary: I drained the radiator stopcock and took off the hose to the oil cooler (drivers side). Drained completely. Added distilled water until full, drove till warm (maybe 15 minutes), stopped and drained. Repeated for a total of FOUR times until the coolant drained was essentially clear. After last drain, added back concentrate to 1/2 of the stated capacity and then topped off with distilled water.
For the secondary: Same thing but only drain was secondary radiator stopcock. Same four drain/refill cycles to get to clear water.
Mountain Pass
Joined: Apr 2021
Posts: 234
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So with the t stat, how long do you have to drive? Without t stat, how long to drive?
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Fleet Mechanic
Joined: Feb 2018
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Originally Posted by Paul Mattick;[url=tel:20067433
20067433[/url]]Thanks for the reply, did you still use an additive with the yellow coolant?
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From: Cartersville, Ga
It’s the fact that you don’t have to drive. It can idle in the driveway and achieve the same results when the t-stat is out. I detach the hose returning to the degas bottle and let it drain while topping the system off with water. When the water out of the return hose starts pushing clean water, I dump the system one more time, add my 50% quantity of coolant, then top off with water giving me a perfect 50/50 mix. It takes around 45 mins to an hour to do the primary system this way.
Fleet Mechanic
Joined: Feb 2018
Posts: 1,592
Likes: 204
It’s the fact that you don’t have to drive. It can idle in the driveway and achieve the same results when the t-stat is out. I detach the hose returning to the degas bottle and let it drain while topping the system off with water. When the water out of the return hose starts pushing clean water, I dump the system one more time, add my 50% quantity of coolant, then top off with water giving me a perfect 50/50 mix. It takes around 45 mins to an hour to do the primary system this way.
Thread Starter
|
New User
Joined: Oct 2019
Posts: 23
Likes: 1
I did it. As you might expect, it's really hard to get everything drained.
For the primary: I drained the radiator stopcock and took off the hose to the oil cooler (drivers side). Drained completely. Added distilled water until full, drove till warm (maybe 15 minutes), stopped and drained. Repeated for a total of FOUR times until the coolant drained was essentially clear. After last drain, added back concentrate to 1/2 of the stated capacity and then topped off with distilled water.
For the secondary: Same thing but only drain was secondary radiator stopcock. Same four drain/refill cycles to get to clear water.
For the primary: I drained the radiator stopcock and took off the hose to the oil cooler (drivers side). Drained completely. Added distilled water until full, drove till warm (maybe 15 minutes), stopped and drained. Repeated for a total of FOUR times until the coolant drained was essentially clear. After last drain, added back concentrate to 1/2 of the stated capacity and then topped off with distilled water.
For the secondary: Same thing but only drain was secondary radiator stopcock. Same four drain/refill cycles to get to clear water.
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