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Old 09-13-2010, 01:40 PM   #1
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Coolant help

I checked my reservoir earlier and it is sitting at the add mark. Looked in the rad cap and noticed it is an orange/rust color. Is this the correct color for the HOAT? I need to add some but I am not sure what to use. Also, if I drain and refill can I just go to Prestone 50/50 pre-mix. It says it is safe for mix with all coolants and is safe for all rads even aluminum. I did this on my Land Rover and no problems (at least not with that particular item lol, LR's always have problems), but would it be safe for my 2002 2.5L? Maintenance seems to have been done on correct intervals at various stealerships in the area. Opinions? Suggestions? Commands?

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Old 09-13-2010, 01:55 PM   #2
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Quote:
Originally Posted by jeepmedic4
I checked my reservoir earlier and it is sitting at the add mark. Looked in the rad cap and noticed it is an orange/rust color. Is this the correct color for the HOAT? I need to add some but I am not sure what to use. Also, if I drain and refill can I just go to Prestone 50/50 pre-mix. It says it is safe for mix with all coolants and is safe for all rads even aluminum. I did this on my Land Rover and no problems (at least not with that particular item lol, LR's always have problems), but would it be safe for my 2002 2.5L? Maintenance seems to have been done on correct intervals at various stealerships in the area. Opinions? Suggestions? Commands?
The HOAT is brown/red in color, you probably have dexcool in there. The only aftermarket carrier of the HOAT is zerex. Zerex G05 I believe is what it's called and it's kinda a pain to find, but NAPA should have some in stock. But yeah, that prestone stuff should be fine, as long as you drain the system and don't mix the coolants. Dexcool=orange Kool aid and that prestone stuff is yellow-green. If you're just going to add coolant then stick with the dexcool coolant, prestone carries it, it should just say extended life on the bottle. Hope this helps!

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Old 09-13-2010, 09:49 PM   #3
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Do the easy thing and get the whole system flushed of that Dexcool stuff and put the trusty old "green" coolant in there.

I couldn't find the Dexcool anywhere around here, including the NAPA store right down the road, a couple years ago, when I got my Jeep.
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Old 09-13-2010, 10:13 PM   #4
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Quote:
Originally Posted by cork1958
Do the easy thing and get the whole system flushed of that Dexcool stuff and put the trusty old "green" coolant in there.

I couldn't find the Dexcool anywhere around here, including the NAPA store right down the road, a couple years ago, when I got my Jeep.
You should be able to get the dexcool anywhere. Like walmart has it, I just had to flush my gf's radiator and they had it. Maybe you meant HOAT? Because yes sometimes it's pretty hard to get your hands on. But yes, I agree with you best thing to do is just flush the system and put the prestone 50/50 greenesque stuff. Unless you're just going to add, only add the dexcool, you don't want to mix.
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Old 09-14-2010, 03:24 AM   #5
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Here are a couple handy charts of the different coolants and applications
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Old 09-14-2010, 07:46 AM   #6
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IAT Antifreeze: The Green stuff, contains more silicates which can be good for stopping leaks but could be bad for pitting and plugging up your system. Some diesel engines tend to have a problem with it. Might not be available in extended life (5 years versus 2 years) form, best to check. It's the "cheaper" stuff, but it works and has worked for years.
HOAT Antifreeze: Could be orange (Chrysler) or could be yellow (Ford). It contains reduced silicates and no phosphates. Not readily avaliable. Available at Wal-Mart here, It's an extended life antifreeze (5 years, 150,000 miles).
OAT Antifreeze: Mostly what's on the shelves these days. Similar to Dexcool and has no silicates or phosphates. Peak and Prestone brands are popular. Peak has an extended life and a lifetime version.
For topping up, HOAT or OAT would be fine, even IAT in a pinch.

For long life, when draining, flushing and replacing, HOAT would be the choice per your Owner Manual, but OAT would be fine as well. Depending on how long you might keep your Jeep, you might want to consider the Peak lifetime antifreeze. To get most of the old antifreeze out of your system (90%+), it will take about 5 drains, refills, runs using the radiator drain method.
When mixing antifreeze and water, use demineralized or distilled water per your Owner Manual.
Sounds like your system already has HOAT in it.
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Old 09-14-2010, 11:18 AM   #7
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Quote:
Originally Posted by jeepmedic4 View Post
I checked my reservoir earlier and it is sitting at the add mark. Looked in the rad cap and noticed it is an orange/rust color. Is this the correct color for the HOAT? I need to add some but I am not sure what to use. Also, if I drain and refill can I just go to Prestone 50/50 pre-mix. It says it is safe for mix with all coolants and is safe for all rads even aluminum. I did this on my Land Rover and no problems (at least not with that particular item lol, LR's always have problems), but would it be safe for my 2002 2.5L? Maintenance seems to have been done on correct intervals at various stealerships in the area. Opinions? Suggestions? Commands?
The Zerex HOAT is a orange rust color
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Old 09-14-2010, 11:43 AM   #8
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Don't buy that 50/50 crap, you're paying for half water. If you're hung up on using tap water, buy a gallon or two of distilled water.
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Old 09-14-2010, 01:21 PM   #9
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Originally Posted by Ted_D View Post
The Zerex HOAT is a orange rust color
It may look that way when looking through the clear area on the container. I have containers of what I took out of my Van and Jeep. Pouring some into another container so I can see the actual color has it showing as pinkish orange.

From this site: Color of Antifreeze
Quote:
Hybrid Organic Acid Technology (HOAT) is a combination of IAT and OAT with nitrites added. This makes HOAT suitable for use in both light duty and heavy duty systems. Currently, two manufacturers are using HOAT for their vehicles. Daimler/Chrysler's version is dyed orange and contains 10% recycled antifreeze. Ford Motor Company's version is dyed yellow and does not contain any recycled antifreeze. Both of these HOAT antifreezes use the marketing designator of GO-5. They are compatible with each other but mixing them with IAT or OAT is not recommended. The normal HOAT antifreeze service life is 5 years or 150,000 miles (250,000 km).
As to mixing (another Post), best to buy the unmixed if flushing out your system so that little or none of the original antifreeze stays in there, because your system will only be about 50% empty (using radiator drain method and draining atleast 5 times).
If using 50/50 solution, figure out how much pure antifreeze your system needs, put that amount in, and then top up with distilled or demineralized water.
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Old 09-16-2010, 09:27 AM   #10
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Coolants

Quote:
Originally Posted by jeepmedic4 View Post
I checked my reservoir earlier and it is sitting at the add mark. Looked in the rad cap and noticed it is an orange/rust color. Is this the correct color for the HOAT? I need to add some but I am not sure what to use. Also, if I drain and refill can I just go to Prestone 50/50 pre-mix. It says it is safe for mix with all coolants and is safe for all rads even aluminum. I did this on my Land Rover and no problems (at least not with that particular item lol, LR's always have problems), but would it be safe for my 2002 2.5L? Maintenance seems to have been done on correct intervals at various stealerships in the area. Opinions? Suggestions? Commands?
Hello to all,
I am the tech manager at prestone, pretty good answers here. I personally recommend that you flush and refill with Prestone, but you do a flush, I wouldnt recommend using the 50/50. Why? Because you will still have some water left in the block after flushing and 50/50 may not give you enough of a concentration. We recommend pouring 1/2 o the concentrate in straight up after a flush, then take the second half and mix with distilled water with the rest. The second bottle can be 50/50 mix.
I have a question for forum members, I am looking to buy a wrangler. I used to have dune buggy, wife misses going off road and now wants a jeep. So, I have 5k to spend and really looking for a rust free jeep, I am a mechanic and can fix anything else. I want to know the pros and cons of 4cyl vs 6cyl and what is the good and bad of YJ vs TJ?
Thanks!
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Old 09-16-2010, 11:10 AM   #11
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Originally Posted by motorking View Post
Hello to all,
I am the tech manager at prestone, pretty good answers here. I personally recommend that you flush and refill with Prestone, but you do a flush, I wouldnt recommend using the 50/50. Why? Because you will still have some water left in the block after flushing and 50/50 may not give you enough of a concentration. We recommend pouring 1/2 o the concentrate in straight up after a flush, then take the second half and mix with distilled water with the rest. The second bottle can be 50/50 mix.
I have a question for forum members, I am looking to buy a wrangler. I used to have dune buggy, wife misses going off road and now wants a jeep. So, I have 5k to spend and really looking for a rust free jeep, I am a mechanic and can fix anything else. I want to know the pros and cons of 4cyl vs 6cyl and what is the good and bad of YJ vs TJ?
Thanks!
Thanks for your response. It's great to see a manufacturer's representative providing information and being a source of information. Best you start a new Thread on this. In fact I will take the liberty of doing it for you. "Motorking wants a Jeep" @ http://www.wranglerforum.com/f5/moto...tml#post774863 .
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Old 09-18-2010, 04:07 PM   #12
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Quote:
Originally Posted by jeepmedic4 View Post
I checked my reservoir earlier and it is sitting at the add mark. Looked in the rad cap and noticed it is an orange/rust color. Is this the correct color for the HOAT? I need to add some but I am not sure what to use. Also, if I drain and refill can I just go to Prestone 50/50 pre-mix. It says it is safe for mix with all coolants and is safe for all rads even aluminum. I did this on my Land Rover and no problems (at least not with that particular item lol, LR's always have problems), but would it be safe for my 2002 2.5L? Maintenance seems to have been done on correct intervals at various stealerships in the area. Opinions? Suggestions? Commands?
Your Jeep calls for Mopar Antifreeze or Zerex G05 Antifreeze, NOT Prestone or Prestone "universal" antifreeze.

You can get the Mopar at any Chrysler or Jeep dealer, or the Zerex G05 at many auto parts stores.

See the Zerex here:

Valvoline.com > Products > Antifreeze Radiator Products > Antifreeze > Zerex G-05® Antifreeze / Coolant

If you plan on flushing your system, I have used the Prestone Flush-n-Fill kit and detailed it here:

Coolant Flush

Use the straight antifreeze (not the 50/50 pre-mix) and use distilled water, not tap water.

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