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Old 08-29-2020, 11:38 AM   #1
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Talking Coolant Recommendations Please

Looking for recommendations re: CAT diesel 3126B engine coolant please.
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Old 08-29-2020, 11:47 AM   #2
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The preferred coolant (by CAT) is the Extended Life Coolant (ELC). It is a red color. No SCA is needed with this coolant.

The coolant that came in your Coach was ethylene glycol (green) and required a Supplemental Coolant Additive (SCA). There is nothing wrong with this coolant but you have to test the SCA level annually (there are test strips) and add SCA if the levels are low.

The two types are not compatible (can't be mixed), so if you want to switch to ELC you need to flush the cooling system until water runs clear, then you can put in ELC.
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Old 08-29-2020, 06:53 PM   #3
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How old is the coach? If the coolant is OEM, call the chassis manufacturer, they put in the coolant.
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Old 08-29-2020, 07:00 PM   #4
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Quote:
Originally Posted by Cat320 View Post
How old is the coach? If the coolant is OEM, call the chassis manufacturer, they put in the coolant.


Although Caterpillar recommends OAT Coolant, Freightliner, who adds the radiator and front dashboard heat coils does not. From what I was told, Freightliner installed some sensors that are not compatible with OAT Coolant.
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Old 08-30-2020, 11:58 AM   #5
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Thanks for all the info!

Thank you everyone! You provided us with great information - sending us to the Net to search out more info. Certainly enough to know that the coolant in there now (which is a very weak green color) will be flushed out and replaced. We have a CAT dealer close by that we'll be contacting on Monday to discuss their coolant and have located Rotella ELC also.
Thanks for all your support and info as we wade into the mechanical side of our new to us coach!
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Old 08-31-2020, 09:33 PM   #6
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Just last week I was at my local Freightliner parts counter. I needed to replace my original Freightliner made surge tank on my 2004 Topical Cat C7 and decided to also replace all the coolant.

The original Factory coolant, according to the sticker, was an Alliance Formula with Freightliner spec 48-25134-001. The parts counter gave me Detroit Diesel Power Cool Plus 50/50 Gallon Nitrite Free Extended Life Coolant - OWI 23519396.

I questioned this and they reassured me that this what Freightliner uses. Well 9 gallons at $7.25 each went in and promptly took a 300 mile round trip on mountain climbs and everything seems to be cooling well. I hope it is all good in the long run.
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