Coolant type and low coolant message - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 21 (permalink) Old 05-30-2019, 07:39 PM Thread Starter
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Coolant type and low coolant message

Just got a 2011 3500HD LML with deleted exhaust. 150k

My coolant is a pink / red... anyone know what this is? Picture attached.

Also, I get a low coolant message frequently on my dash message area. Every time I check the coolant, it's above the MIN line. In the picture, that was after the truck was idling for a few min. When it's cold, it's right at the MIN line.

I guess to get rid of the message I should first try to add some coolant? Just didn't know what... stick with the same kind? What is it? I've heard of green, yellow, blue, etc.

Thanks. new to diesels, in case you couldn't tell.
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post #2 of 21 (permalink) Old 05-30-2019, 08:25 PM
J83
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that looks to be the correct color for DexCool, which is the correct coolant for your truck. I got that same message after my delete, had to top off couple times to burp air from the system.

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post #3 of 21 (permalink) Old 05-30-2019, 09:12 PM
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If it's at the MIN when cold, it's time to add some DexCool.

Several manufacturers make it.

Get one of the pre-mixed ones. It's just easier.


If you don't know if the coolant has been changed, it's time to do so.
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post #4 of 21 (permalink) Old 05-31-2019, 06:59 PM Thread Starter
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Quote:
Originally Posted by redwngr View Post
If it's at the MIN when cold, it's time to add some DexCool.

Several manufacturers make it.

Get one of the pre-mixed ones. It's just easier.


If you don't know if the coolant has been changed, it's time to do so.
I added some more brought it up half way between MIN and MAX. I got the premixed dexcool. Hopefully that fixes it. I'm looking in to a coolant flush. How easy to DIY on that?
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post #5 of 21 (permalink) Old 06-01-2019, 02:29 PM
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If you get full strength dex cool use distilled water, not tap water.
You will save $$ if you buy full strength vs pre-mix.
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post #6 of 21 (permalink) Old 06-01-2019, 05:55 PM
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Quote:
Originally Posted by D_R_C View Post
If you get full strength dex cool use distilled water, not tap water.
You will save $$ if you buy full strength vs pre-mix.
He already bought the premixed, & by the time you buy full strength & distilled water it's a coin toss what is cheaper. And like previously mentioned, "it's just easier"
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post #7 of 21 (permalink) Old 06-02-2019, 08:07 AM
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Originally Posted by rockn69 View Post
He already bought the premixed, & by the time you buy full strength & distilled water it's a coin toss what is cheaper. And like previously mentioned, "it's just easier"
Around here Prestone Pre-Mix and full strength Dex-Cool are both around $19. Making two pre mix $38

Distilled water is $.86...making those two gallons cost about $20.

I can buy LOTS of beer or rum for those $18.
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post #8 of 21 (permalink) Old 06-02-2019, 10:28 PM
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Color is correct as mentioned above. Dexcool. But, mine stays topped off completely. If the cooling system was worked on it will take a few heat cycles with refills between to get it back up. I looked at multiple trucks to make sure I wasn’t loosing my mind after I first flushed the system and was chasing a slight coolant leak.
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post #9 of 21 (permalink) Old 06-03-2019, 04:41 PM
J83
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Quote:
Originally Posted by padurmax View Post
I added some more brought it up half way between MIN and MAX. I got the premixed dexcool. Hopefully that fixes it. I'm looking in to a coolant flush. How easy to DIY on that?
its rather simple actually, theres a metal C clip you pull out on the pass side lower radiator hose, then just shimmy the hose back SLOWLY over a large catch pan and it will drain almost everything, i got just shy of 4 gallons out of my system so make sure you have at least that much capacity in your pan. Then close, fill with water, run the engine a bit, drain again, close, fill with 5050 either premix or, preferable because its cheaper, straight coolant and distilled water. you will need to add coolant a couple times more than likely as air burps out.

as for the distilled vs tap water, distilled is always going to be better, however if you live somewhere where the water quality is very good, with a neutral pH and low dissolved solids, than its kind of up to you. you reach diminishing returns on your investment at some point. Also, if you have a RO system in your house then that water is totally fine to use in place of distilled water.

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TCM & ECM Tuning by MotorOps
Y Bridge delete with SS up and down pipes
4" MBRP downpipe back exhaust with muffler

Last edited by J83; 06-03-2019 at 04:44 PM.
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post #10 of 21 (permalink) Old 06-04-2019, 04:01 AM
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I've always used in this order deionized, distilled and lastly tap water.

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