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Old 10-25-2012, 11:55 PM   #1
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2005 tj 4.0 engine coolant question

hey guys just bought my 2005 tj and was going to buy some coolant for it then i read all this stuff about dexcool and how its really bad for my engine so heres my question. I have no idea what coolant is in there now and what was used by the previous owner jeep has 38,800 miles on it and i wanted to use Zerex GO5 (Hoat) but i know you cant mix coolants. the coolant in my jeep now is orange but then i read dexcool can be orange so what should i do? just flush the system? and if so how to i go about doing that? and if i just flushed the radiator out will that be enough? trying to do the right thing as i intend on keeping my jeep till she trades me in any advice is appreciated

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Old 10-26-2012, 07:51 AM   #2
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Nothing???

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Old 10-26-2012, 08:07 AM   #3
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If you don't know the history, the smart thing to do is a complete flush and refill with G-05. The original HOAT coolant was red in color, which some might describe as orange.

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and if i just flushed the radiator out will that be enough?
The majority of the coolant resides outside the radiator.
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Old 10-26-2012, 08:33 AM   #4
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If you don't know the history, the smart thing to do is a complete flush and refill with G-05. The original HOAT coolant was red in color, which some might describe as orange.



The majority of the coolant resides outside the radiator.
OK so just drain from the bolt on the block then I can flush with regular water and then just refill? Any steps Im missing just wanna make sure I don't screw something up
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Old 10-26-2012, 08:40 AM   #5
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Dexcool is a GM product, your jeep won't have it unless someone mistakenly put it in there, which is unlikely.
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Old 10-26-2012, 12:34 PM   #6
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Dexcool is a GM product, your jeep won't have it unless someone mistakenly put it in there, which is unlikely.
Only reason I'm a lil worried I bought if from a Chevy car lot. That's why I'm thinking they might have put it in. Seeing ass most stealerships don't pay attention to what works best with different cars. I called them back and they said they have no idea what kind of antifreeze they put in it. unreal
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Old 10-26-2012, 12:40 PM   #7
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Dexcool is a GM product, your jeep won't have it unless someone mistakenly put it in there, which is unlikely.
Pray that no one put Dexcool in.
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When you have a choice, buy American.

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Old 10-26-2012, 12:53 PM   #8
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You need to flush the whole system. Radiator and block. They make a flush product that also helps get rid of any deposits like lime or calcium build up from using tap water. This way 100% of your system is free of contaminates.
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Old 10-26-2012, 01:03 PM   #9
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Dexcool is a GM product, your jeep won't have it unless someone mistakenly put it in there, which is unlikely.
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You need to flush the whole system. Radiator and block. They make a flush product that also helps get rid of any deposits like lime or calcium build up from using tap water. This way 100% of your system is free of contaminates.

OK ill just pick some of that up today probally going to do this tomorrow if not definitely on Sunday. Is the drainage bolt easy to get to / get off.? I got a buddy of mine helping me who is a mechanic so we should be good.
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Old 10-26-2012, 01:30 PM   #10
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Yea there is a drain plug under the radiator. Easy to get to. Just follow the directions on the bottle for the flush. It's mostly poor this, run for that, drain, repeat. Then fill with 50/50 and you're good to go. Just make sure to purge the air bubbles out. You do that by filling up the system. Then running the engine while your radiator cap is open. You will see bubbles and the level will drop. Fill as needed. Oh if your drain plug is rusted fast you can pop the lower rad hose as well. Same effect.
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Old 10-26-2012, 06:24 PM   #11
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Yea there is a drain plug under the radiator. Easy to get to. Just follow the directions on the bottle for the flush. It's mostly poor this, run for that, drain, repeat. Then fill with 50/50 and you're good to go. Just make sure to purge the air bubbles out. You do that by filling up the system. Then running the engine while your radiator cap is open. You will see bubbles and the level will drop. Fill as needed. Oh if your drain plug is rusted fast you can pop the lower rad hose as well. Same effect.
great thanks for the help guys really appreciate all the info

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