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Old 01-01-2013, 11:56 PM   #1
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Special coolant requirements in a 2001 TJ

Guys,

I've been reading through the shop manual on the 2001 TJ I recently required, and have a question concerning the proper type of coolant needed. I've alway used a 50/50 mixture of distilled water and Prestone antifreeze, but the shop manual says I should be using a special Chysler coolant with HOAT additives, does anyone know if this is required?

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Old 01-02-2013, 02:27 AM   #2
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Does your jeep cool just fine?

Leave it that way. Lol

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Old 01-02-2013, 03:12 AM   #3
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Either the typical green antifreeze or extended life antifreeze will work fine provided you follow the correct service intervals and maintain the proper concentration and don't mix them.

Extended life antifreeze have an additive package called OAT which stands for Organic Acid technologies. OAT antifreezes such as Dexcool last much longer because of the type of corrosion inhibition molecules that are used.

However OAT antifreeze and conventional antifreezes such as green ethylene products are not compatible and they can not be mixed. If mixed precipitation will take place and the coolant will loose it's protective properties.

HOAT products are known as hybrids. They use OA technology but have an additive package that prevents precipitation. The reason why HOATs are recommended is you get the best life without the negatives associated with mixing by mistake.
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Old 01-02-2013, 08:21 AM   #4
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Quote:
Originally Posted by ChuckM View Post
...but the shop manual says I should be using a special Chysler coolant with HOAT additives, does anyone know if this is required?
HOAT is the specified coolant for your year model. It's not a suggestion or a recommendation. It's a specification.
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Old 01-02-2013, 09:23 AM   #5
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Quote:
Originally Posted by ChuckM View Post
Guys,

I've been reading through the shop manual on the 2001 TJ I recently required, and have a question concerning the proper type of coolant needed. I've alway used a 50/50 mixture of distilled water and Prestone antifreeze, but the shop manual says I should be using a special Chysler coolant with HOAT additives, does anyone know if this is required?
read this:
http://www.wranglerforum.com/f5/that...ml#post2223357
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Old 01-02-2013, 10:30 AM   #6
Knows a couple things...

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A very good HOAT coolant to use is Zerex G-05, you can find it locally in most better auto parts stores. NAPA normally carries it in my area but my local Autozone does not... hence my "better" auto parts store recommendation.
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Old 01-02-2013, 07:00 PM   #7
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Again the H stands for "hybrid" and is designed to be mixed with OAT and IAT coolants. I am not saying that it is necessarily what you should do, but it is the concept behind HOAT...to prevent people from accidentally mixing OAT with IAT.
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Old 01-02-2013, 07:39 PM   #8
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Hey guys, let me back track a bit....I did some digging and checked with our automotive group. Keep in mind that I work for the company that essentially invented all this technology in the first place.

Here is the problem....you don't really know what is in one bottle vs the other and HOAT ingredient packages have evolved.

From a practical stand point, don't mix coolants and you will likely be best served using what the manual recommends.

I would even avoid mixing different brands. Not all yellow, or green, or orange is the same although they all belong to the same groups of products. Though I would not panic.

Mixing green with yellow or orange is likely a bigger problem than say mixing orange with yellow. But again, best to not mix.

Most HOAT is really similar to OAT with the addition of silica based corrosion inhibitors. Silica is mostly designed for aluminum corrosion inhibition but it can precipitate and cause issues if the proper chemistry is not maintained.

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