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Old 05-07-2013, 08:51 AM   #1
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a couple of questions...

What coolant should I run in my 99 4.0 wrangler? I have flushed the coolant system, replaced the thermostat, water pump, radiator, and all hoses.
Also, it seems I have a exhaust leak somewhere around the exhaust header. Is the header on these things prone to leaking?
Thanks!
Jerry

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1999 Jeep Wrangler Sport Chili Pepper Red 4.0 5 speed ford 8.8 rear
hardtop and trektop nx Hella e codes

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Old 05-07-2013, 08:57 AM   #2
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For the header, they are known to crack. Look around on the header pipes for any little cracks. Are you hearing it?

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Old 05-07-2013, 10:06 AM   #3
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Yes. Kinda hard to see in there from the top.
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Old 05-07-2013, 12:41 PM   #4
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I still need help with the coolant please.
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Old 05-07-2013, 05:45 PM   #5
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Bump
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Old 05-07-2013, 05:52 PM   #6
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For my 99 TJ 4.0 I just use regular green antifreeze from Pep Boys or wherever else (I prefer Peak or Prestone but it really doesn't matter). 10 quarts will fill the system. Buy 2 gallons of pure antifreeze and 2 gallons of DISTILLED water from the local supermarket or CVS, and pour in a 50/50 mix. You will have leftovers for next time of course.

I have also used the pre-mixed variety with good results. More expensive but it takes away the step of mixing.

The 99 4.0 does not need or want that other orange Dex-Cool antifreeze sold in the stores if that was the reason for your question.
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Old 05-07-2013, 08:26 PM   #7
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Yes, I am just wanting to put what is best for my jeep in it. I didn't want to use something that I shouldn't.
Thanks!
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hardtop and trektop nx Hella e codes

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Old 05-08-2013, 12:03 AM   #8
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Use Zerex (napa sells it) or Mopar coolant...but since you flushed you can run whatever you want. If I was you i'd stick with a HOAT coolant.

Valvoline.com > Products > Zerex > Antifreeze Zerex > Zerex G-05® Antifreeze / Coolant
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Old 05-08-2013, 01:11 AM   #9
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Coolant is coolant, it's not like synthetic oil vs conventional oil. As long as its green coolant it will work, there is no "best coolant" I would recommend buying 2 gallons Coolant without water. Because once you do mix with water, that leaves you with twice the amount; plenty of leftovers. If you buy 50/50 its obviously turned into a convince thing, so then the price jumps. And your actually getting less, but paying more.
Ex: 2 Gallons of Straight Antifreeze no water, Mixed with 2 gallons water gives you 4 Gallons 50/50 :^D... 2 Gallons of 50/50 Antifreeze costs more money, but you only get 2 gallons :^(. Hmmm mix the stuff with water yourself!! Nice little tip that not very many people think of.
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Old 05-08-2013, 02:04 AM   #10
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Quote:
Originally Posted by Purp420Kush View Post
once you do mix with water, that leaves you with twice the amount; plenty of leftovers. If you buy 50/50 its obviously turned into a convince thing, so then the price jumps. And your actually getting less, but paying more.
Ex: 2 Gallons of Straight Antifreeze no water, Mixed with 2 gallons water gives you 4 Gallons 50/50.
Just make sure you use distilled water
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Old 05-08-2013, 06:10 AM   #11
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Thanks for the info guys! This is my first wrangler and I am itching to get this thing ready and reliable for the summer! The only thing I haven't replaced is the heater core, coolant system wise. I hope it'll last for a while.

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