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Old 12-06-2013, 09:54 AM   #1
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Coolant question - 2002 TJ wrangler

My Jeep overheated today (12 degrees outside) go figure. I am pretty sure the coolant was low as to why this happened. I barely made it to work so I can't look at it until after work today. My question is what kind of coolant does the TJ take? I have read Zerex G-05 HOAT. Can the GM orange Dex-cool be used? 2002 wrangler 4.0 liter - what do you guys recommend?
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Old 12-06-2013, 04:20 PM   #2
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Here is something I stole from another thread - http://www.wranglerforum.com/f282/oi...tml#post701441

Quote:
Originally Posted by TJeepman View Post
Original Green IAT (Inorganic Additive Technology) versus HOAT (Hybrid Organic Acid Technology) versus OAT (Organic Acid Technology):
Original Green has silicates (which are good for stopping leaks but can cause clogging and other possible issues with newer technology engines), HOAT has less silicates and OAT has no silicates. All three can be purchased as extended life antifreeze (5 years), Peak actually has a "lifetime" silicate free antifreezee available.
Valvoline makes a variety of antifreezes including the Zerex G-05 HOAT long life/low silicate antifreeze used by Ford and Chrysler since about 2001.
Looking at Technical Data for Valvoline antifreezes:
- Valvoline Original Green: Inorganic Additive Technology (IAT); 5 year, 100,000 miles; low silicate
- Valvoline G-05 HOAT: Hybrid Organic Acid Technology; 5 years, 150,000 miles; low silicates & no phosphates.

- Zerex Dex-Cool OAT: Organic Acid Technology; 5 years, 150,000 miles, silicate and phosphate free.

The OAT antifreeze seems to be the more readily available long life type. Peak and Prestone for examples.
HOAT has limited availability but they do carry it at WalMart here. Auto Supply stores will have it as well. Don't expect to find it on the shelves at your local gas stop though.
Any of the above Valvoline products will work in your Jeep, but may as well stick with what the Owner Manual says.

As to draining, there are a few tricks. I usually have my vehicle on the level. Keep your radiator cap closed to drain the reservoir, open it if you want faster drainage. The drain valve near the bottom of your radiator only needs to be loosened up a bit to drain, too much and you may dislodge the valve. Don't force it. Clean out dirt if clogged. Haynes Manual is good on this.

I use demineralized water (the big 18 liter jugs), some use distilled water, to flush and refill. If you drain, refill, run your engine about 6 times, you will get most (95% thereabouts) of the old fluid out. In that case, you will have mostly water left in your system. Final refilling will need to be done with straight antifreeze using the amount calculated for your total refill and then top up with water.

As to differential fluid, I am using 75W-140 full synthetic, even though I don't need to if I were going to change it every once in awhile. 75W-90 should be fine. For colder temperatures, synthetic flows a little better.

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Old 12-09-2013, 09:10 AM   #3
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Thanks for the coolant info walle. I went over to Oreillys and picked up a gallon of Zerex G-05. Did a 50/50 mix with distilled water and topped off the coolant reservoir. Removed the radiator cap and burped the system. No overheating now. Keeping some in the back of the Jeep premixed now for the "just in case".
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Old 12-10-2013, 09:37 PM   #4
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Just when one thinks the problem is fixed, it overheated again today. This time i tore into the cooling system and took the thermostat out. To my surprise I found some black resin plastic pieces stuck inside the thermostat. Very weird - never seen that before. I checked everywhere I could get into for more of it but it looks like it was contained in the thermostat. My guess is it was pieces of a stock raditor (black plastic part) that some how got into the thermostat area. Very weird. I have an aftermarket aluminum 3 core radiator now, (bought the Jeep that way). I put in an OEM 195 degree thermostat and new gasket and I am back on the road and the temp is right where is should be. My heater is really cooking now as well. Ohh yea, I carefully purged the heater core thru the 2 hoses to make sure it was clear and it was. I'll take a picture of the failure and post it here later.
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Old 12-11-2013, 02:12 PM   #5
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Quote:
Originally Posted by quarkdude View Post
Just when one thinks the problem is fixed, it overheated again today. This time i tore into the cooling system and took the thermostat out. To my surprise I found some black resin plastic pieces stuck inside the thermostat. Very weird - never seen that before. I checked everywhere I could get into for more of it but it looks like it was contained in the thermostat. My guess is it was pieces of a stock raditor (black plastic part) that some how got into the thermostat area. Very weird. I have an aftermarket aluminum 3 core radiator now, (bought the Jeep that way). I put in an OEM 195 degree thermostat and new gasket and I am back on the road and the temp is right where is should be. My heater is really cooking now as well. Ohh yea, I carefully purged the heater core thru the 2 hoses to make sure it was clear and it was. I'll take a picture of the failure and post it here later.
-quarkdude
Here is the problem thermostat. Yikes..

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