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Old 10-14-2021, 07:07 PM   #1
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How much coolant

Hi everyone, looking to see who has flushed their coolant. I have an 07 400 ISL. wanting to put the OAT in. Canít find my manual and Cummins can only tell me how much the engine will hold.

Anyone have an idea how many gallons these things hold?

Thanks,
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Old 10-14-2021, 07:19 PM   #2
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Pat, you can download a digital copy of your owners manual here:
https://www.holidayrambler.com/owner.../owner-manuals

These are great for performing searches.

I changed our coolant to Cummins Compleat OAT. It was pretty straight forward but time consuming with all the filling and draining required to get all the old coolant out and then the flush agent out. Different engine, but the procedure is the same.
http://www.irv2.com/forums/f123/chan...at-389479.html
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Old 10-16-2021, 08:26 AM   #3
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8 Gallons
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Old 10-17-2021, 03:02 PM   #4
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My coach, with ISC, took 11 gallons and I don't have aquahot.
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Old 10-17-2021, 06:39 PM   #5
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Believe my manual states 50 - 55 quarts. Thats with AH system.
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Old 10-18-2021, 05:59 PM   #6
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Thank you

Vito gave me a web site for my manual, great help. Calls for 39 qts. Just finished installing four front shocks and door awning motor, as soon as the coolant comes Iíll flush the system, then service the trans. Never ends,

Thanks again everyone, stay healthy!
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Old 10-19-2021, 10:06 AM   #7
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Go ahead & buy 10 gallons, but you`re gonna have 2 gallons left over -- Bill Willard
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Old 10-19-2021, 10:32 AM   #8
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Quote:
Originally Posted by William Willard View Post
Go ahead & buy 10 gallons, but you`re gonna have 2 gallons left over -- Bill Willard
Yeah, when I change mine, I only get 8 gallons out.
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Old 10-20-2021, 01:09 PM   #9
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Thatís okay if I have extra. Using the oat million mile. Iíll use the extra when I do the genny. Thanks again everyone!
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Old 10-20-2021, 01:25 PM   #10
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I strongly suggest you buy coolant concentrate, not pre-dilute.


If you use distilled water for the last flush/rinse, you just add 1/2 the cooling system volume in concentrate and top off with distilled water.


Unless you go to the trouble of blowing out/removing water from the hoses from engine to front, dash heater core, bottom of radiator, etc, you will never achieve a 50/50 mixture using pre-dilute.
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Old 10-20-2021, 03:04 PM   #11
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Is it always recommended you do your own flush? Should shops also flush out the entire system and then put new coolant and if they don't is there a down fall? Ive been doing a little research and also calling shops around town and they all say its like an hour of labor charge if i bring coolant ....hummm



An this is on a 2004 Holiday Rambler Scepter (cummins ISC)
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Old 10-20-2021, 03:16 PM   #12
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Quote:
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Is it always recommended you do your own flush?



Ive been doing a little research and also calling shops around town and they all say its like an hour of labor charge if i bring coolant ....hummm

Answer to first sentence: Yes, YOU will to a better job (with even very basic mechanical skills) than a shop. It is very low tech but quite time consuming to do correctly.


You do NOT want to mix gallons of old coolant (likely acidic) with new coolant. One hour will leave you with a MESS-- some new coolant/some old.


If you want the "step by step" for doing it correctly, let us know.
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Old 10-20-2021, 03:23 PM   #13
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An hour labor is a bargain --Also a shop to stay away from if they can do a through flush in that time frame -- Bill Willard
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Old 11-06-2021, 05:06 PM   #14
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Update.

Thanks for the responses. I am pretty mechanically inclined, so it took about 5-hours flushing twice allowing to cool in between. Took and total of 32-qts, Iím sure the difference is contained within the block.

So Iíll flush the genny and enjoy.

Thnx again, happy holidays and be safe!
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