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Old 09-15-2021, 12:45 PM   #1
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What kind of coolant do I add to reservoir

Hello everyone,

I'm new to using this site and the whole RV thing. Bought a 1999 Fleetwood Bounder 39Z and I'm learning everything from sites like this and youtube etc.

Question is wife and I are leaving for 2 week trip to Canada in 3 days. I need to add coolant to the reservoir because it's down a bit.

I have no idea what kind to put into it. It's orange in color.

I've read somewhere that there different kinds. Cheaper ones I think have ethynol and better ones are propylene glycol I think ?

What should I add ? It's our last trip before we winterize it and I don't want to have to have a flush done.
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Old 09-15-2021, 12:49 PM   #2
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What engine do you have?
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Old 09-15-2021, 02:42 PM   #3
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It's a Cummins
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Old 09-15-2021, 05:43 PM   #4
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Diesels require there own type of coolant, you can’t use regular auto stuff which I’m sure you already know.

The biggest issue is to find out if it is just standard coolant that requires you to test for SCAs or if someone switched it to an OAT that doesn’t require SCAs. If the previous owner didn’t mention flushing and changing it over it probably just has standard coolant. Mine has been changed to Fleetguard OAT and it is pink not orange.

I would contact local Cummins shop and pick up what is the standard coolant for that series of engine and also pick up some test strips to check your SCA count. Improper SCA levels can cause cavitation and damage to cylinder walls.
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Old 09-15-2021, 09:46 PM   #5
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Thank you very much
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Old 09-16-2021, 05:06 AM   #6
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"I've read somewhere that there different kinds. Cheaper ones I think have ethynol and better ones are propylene glycol I think ?"

I think maybe you are confusing comments about RV (fresh water) anti freeze with engine coolant anti freeze. The above applies to the RV type - pink stuff - thats potable water system safe.

For engine coolant its important to use the same stuff to top off as mixing coolants generally NOT recommended. You need to figure out what kind of diesel AF was used.

Don't be tempted to use any auto parts store stuff that claims " safe to use with any other coolants".
NAPA can generally get anything you need overnight once you figure out what it is.

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Old 09-16-2021, 06:58 AM   #7
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Here is a document showing the colors of various coolants.

Just a word of warning. Freightliner, the manufacturer of the chassis, does not recommend the use of OAT coolants in their engine/chassis products. It seems Freightliner installs several sensors that are not compatible with OAT Coolants. Although engine manufactures do recommend OAT, Freightliner chassis manufacture does not.

That being said, five years ago I switched to OAT Coolant before I learned about Freightliner's stance on coolants. So far so good with my coach.
Attached Files
File Type: pdf LT36262 Coolant Cross Reference Brochure.pdf (825.6 KB, 9 views)
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Old 09-17-2021, 05:43 PM   #8
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Thank you everyone. I did find out the correct coolant and filled reservoir.
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