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Old 05-05-2013, 05:01 PM
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Adding Engine Coolant

I've had my 2012 JCG Overland since Dec 2011 and when looking at the engine today I noticed that my coolant level looks low. I'll check again tomorrow after driving home to see what it looks like after the engine's warm. Is it normal to drop that much in 1.5 years?



I checked the manual to see what kind of coolant I'd need to buy. Doesn't list any part numbers or anything. Is this the right stuff?



Thanks!
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Old 05-05-2013, 05:29 PM
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Re: Adding Engine Coolant

The coolant level on my CRD Overland ( oct 2011 ) was also low , but the thermostat had a minor leak. The leak on a hose from the steering pump was worse. Both replaced under warranty last week .
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Old 05-05-2013, 07:10 PM
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Re: Adding Engine Coolant

OM says "MOPAR Antifreeze/Coolant 5 Year/100,000 Mile Formula HOAT (Hybrid Organic Additive Technology) or equivalent." and is yellow.

That said the case of Peak Long Life in my garage says 5 year/150,000 mile and from the web site: "PEAK® LONG LIFE® Antifreezes & Coolants feature a LONG LIFE® coolant technology that is compatible for use in all automobiles and light-duty trucks, regardless of make, model, year or original antifreeze color."

Personally I prefer to buy full strength antifreeze and suppliment with some of the gallons of distilled water (88 cents) I keep around.

Just a bit more than you wanted to know:

"Automotive antifreeze/coolant is made of ethylene glycol, water, and a chemical additive package.
...
Dexcool-type extended life coolants use organic acid technology to inhibit corrosion, and are referred to as OAT based coolants.
...
HOAT formulations are called hybrid because the additive package contains ingredients from both OAT and conventional formulas and is compatible with both."

If you really want to know what is in antifreeze, look for a MSDS (Material Safety Data Sheet) that must list the ingredients. All Antifreeze sold in the country must have a MSDS.

A (H)OAT will have an entry for something like Organic acid salts, Green won't.
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Old 05-06-2013, 12:10 PM
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Re: Adding Engine Coolant

The HOAT antifreeze is hard to find. The yellow stuff that claims to be OK for all coolant systems is not OK for the HOAT requirement. The only aftermarket brand that I saw that had the HOAT coolant was Zerex. I just went with the Mopar brand. It is an orange-pink color. When mixed it just looks pink.
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Old 05-06-2013, 12:33 PM
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I went mopar also but when I filled it up recently I went with zerex g-o5 which meets the mopar hoat spec
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Old 05-06-2013, 01:05 PM
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Re: Adding Engine Coolant

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Originally Posted by hummer recovery team View Post
I went mopar also but when I filled it up recently I went with zerex g-o5 which meets the mopar hoat spec
I'm curious about your username, care to elaborate?
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Old 05-06-2013, 03:08 PM
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Hummer recovery team, it basically means that when bummers go in the ditch and need recovering or rescue ill be there in my jeep to help them out, it's supposed to be a joke, lol
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Old 05-06-2013, 05:01 PM
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Re: Adding Engine Coolant

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Originally Posted by hummer recovery team View Post
Hummer recovery team, it basically means that when bummers go in the ditch and need recovering or rescue ill be there in my jeep to help them out, it's supposed to be a joke, lol
Got it. I wheeled at Paragon Park in Hazelton, PA for several years and rode along with many CJ's, YJ's and TJ's. The highly modified Jeeps were incredible, especially when it came to the rock crawling trails. I wheeled with both my 2-door (XLC2) and 4-door wagon (HMCS) Hummers. They were both pretty much stock and I managed to do most trails without any major problems. I did have some cosmetic damage here and there mostly because of the width of the Hummer. One winter event in the snow, I managed to blow apart my transfer case on a hill climb.

For the most part, both jeep and hummer owners (+ the occasional land rover owner) wheeled the same trails and helped each other out when necessary. I personally never witnessed a wrangler recover a hummer (not saying it didn't happen). On the other hand there were these H2's and H3"s that had the hummer name that needed lots of assistance. Actually the H3"s wheeled quite well as compared to the H2's.

Now back to engine coolant.
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Old 05-06-2013, 07:27 PM
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Re: Adding Engine Coolant

Quote:
Originally Posted by hummer recovery team View Post
I went mopar also but when I filled it up recently I went with zerex g-o5 which meets the mopar hoat spec
What's the part number for the MOPAR stuff? Or do I have the correct product pictured?
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Old 05-06-2013, 10:59 PM
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I think the stuff you have pictured is correct
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Old 05-10-2013, 10:21 AM
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Re: Adding Engine Coolant

Quote:
Originally Posted by unimatrixzer0 View Post
I've had my 2012 JCG Overland since Dec 2011 and when looking at the engine today I noticed that my coolant level looks low. I'll check again tomorrow after driving home to see what it looks like after the engine's warm. Is it normal to drop that much in 1.5 years?



I checked the manual to see what kind of coolant I'd need to buy. Doesn't list any part numbers or anything. Is this the right stuff?



Thanks!
That much change is pretty normal. Especially when new. Most new vehicles I have had needed to be topped up within the first 6 months. Trapped air will work itself out. On top of that, you will experience evaporation. The reservoir bottle is open to the atmosphere. To be quite honest, you would have no problem simply adding distilled water to bring the level up. The minor amount of dilution is not going to change the mixture or freeze point significantly. To bring it from where it is up to the full mark might be 1/16th the total volume of the system.
If you choose to add coolant/ water, then what you have pictured is the correct one. Commander uses the same stuff.
http://www.jeepdex.com/Commander/DOC...%20coolant.pdf
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