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Unread 01-10-2012, 12:21 AM   #1
jjfred2112
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Coolant recommendation

What type of coolant should I use for my 2001 Jeep Grand Cherokee Laredo 4.0 L6? I was talking to someone who was saying universal coolant is not recommended. If that is the case, first, what kind of coolant should I look for? And secondly, can I get that type at my local auto part store (auto zone, advance, o'reilly, etc....)

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Unread 01-10-2012, 07:24 AM   #2
specia1k
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I've been using the Advance Auto Parts brand recently (5yr/100K) full strength then mix 50/50 with distilled water. I've recently replaced the Water Pumps so drained the coolant as part of the procedure. Reading the label, it appears to be the same ingrediants as the anme brand. No different than generic brands at the drug store. Label's the same as the name brand, just not paying for the price increase due to advertizing.
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Unread 01-10-2012, 08:36 AM   #3
ChrisHager
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Zerex G-05 or dealer fluid. Zerex is a decent price and is a HOAT coolant.

Edit: I get the Zerex from O'Reilly Auto Parts...
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Unread 01-10-2012, 09:39 AM   #4
cbeck
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I had my radiator replaced due to a leak when i bought my 2004 GC Overland (75K) and after checking with the shop, it appears they used universal fluid in the new radiator (it was not a Chrysler shop).

Should I be worried and flush and replace with HOAT now, or just let it go until next scheduled flush?
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Unread 01-10-2012, 09:48 AM   #5
ChrisHager
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This is from wjjeeps.com:

Quote:
Coolant recommendations and cautions:

The recommended mixture is 50/50 ethylene-glycol and low mineral content water. Never use pure antifreeze. Only Mopar Antifreeze Coolant, 5 Year/100,000 Mile Formula (glycol base coolant with corrosion inhibitors called HOAT) is recommended. This coolant offers the best engine cooling without corrosion when mixed with 50% distilled water.

Antifreeze mixture must always be at least 44%, all climates year round. Maximum protection (-90d) is provided with a 68% mixture protection. If the percentage is lower than 44 percent, engine parts may be eroded by cavitation, and cooling system components may be severely damaged by corrosion.

CAUTION: Mopar Antifreeze/Coolant, 5 Year/100,000 Mile Formula (MS-9769) may not be mixed with any other type of antifreeze. Mixing of coolants other than specified (non-HOAT or other HOAT), may result in engine damage that may not be covered under the new vehicle warranty, and decreased corrosion protection.

CAUTION: Do not use coolant additives that are claimed to improve engine cooling.

4.0L coolant capacity:

1999-2000: 13.0 qts. (including 2.3 qts. for resevoir)
2001-2004: 15.0 qts. (including 1 qt. for resevoir)
There are many people on here using universal fluid and have no problems. I personally stuck with HOAT to avoid issues. If it were me, I'd look into flushing it out for HOAT coolant, but I also wouldn't rush like the engine was going to blow up.
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Unread 01-10-2012, 10:10 AM   #6
jjfred2112
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Thank you everybody for the feedback. I appreciate it. I will be getting some HOAT for sure. I'm at 130,000 miles and I want it to last even longer so I am wanting to take care of it.

JF
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Unread 01-10-2012, 10:26 AM   #7
thisguyhasadd2
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I got mopar hoat 2 gallons undiluted for like 42$
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Unread 01-10-2012, 11:39 AM   #8
jjfred2112
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Quote:
Originally Posted by ChrisHager
Zerex G-05 or dealer fluid. Zerex is a decent price and is a HOAT coolant.

Edit: I get the Zerex from O'Reilly Auto Parts...
How much do you do? 70/30? 60/40? 50/50?
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Unread 01-10-2012, 11:50 AM   #9
ChrisHager
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I did 50/50 or very close to that. In the above quote:

Quote:
Coolant recommendations and cautions:

The recommended mixture is 50/50 ethylene-glycol and low mineral content water. Never use pure antifreeze. Only Mopar Antifreeze Coolant, 5 Year/100,000 Mile Formula (glycol base coolant with corrosion inhibitors called HOAT) is recommended. This coolant offers the best engine cooling without corrosion when mixed with 50% distilled water.

Antifreeze mixture must always be at least 44%, all climates year round. Maximum protection (-90d) is provided with a 68% mixture protection. If the percentage is lower than 44 percent, engine parts may be eroded by cavitation, and cooling system components may be severely damaged by corrosion.

CAUTION: Mopar Antifreeze/Coolant, 5 Year/100,000 Mile Formula (MS-9769) may not be mixed with any other type of antifreeze. Mixing of coolants other than specified (non-HOAT or other HOAT), may result in engine damage that may not be covered under the new vehicle warranty, and decreased corrosion protection.

CAUTION: Do not use coolant additives that are claimed to improve engine cooling.

4.0L coolant capacity:

1999-2000: 13.0 qts. (including 2.3 qts. for resevoir)
2001-2004: 15.0 qts. (including 1 qt. for resevoir)
It does offer other options but basically you want more than 44% antifreeze and not more than 68%. It's easiest to just do 50% in my opinion plus I *think* that creates a good balance between engine protection and cooling.
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Unread 01-10-2012, 01:19 PM   #10
jjfred2112
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Also, I have been looking for instructions on how to flush out my coolant system but I have not had any luck. Anybody help with that?
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Unread 01-10-2012, 01:40 PM   #11
ChrisHager
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Here's how I 'flushed' mine at home:

1. Drain radiator and the radiator overflow tank.
2. Fill radiator with distilled water.
3. Start Jeep (with heater on) and bring to operating temperature (note, if you remove the thermostat, there is no need to bring it to operating temperature since the water will be able to circulate fully) and let the new distilled water circulate for a few minutes.
4. Turn off Jeep.
5. Let cool.
6. Repeat Steps 1-5 multiple times.

Once you've done this over and over, the distilled water should have mixed with and drained most of the old coolant out.

7. Drain the system one final time, add 2 gal of straight HOAT coolant, and top off with distilled water (the capacity for my 04 WJ (same for 01-04) is almost 4 gallons. If you can get 2 gallons of coolant in, you are guaranteed to have at least a 50/50 mix).

Note: The radiator does not hold 2 gallons in and of itself. What I did to aide in cramming the 2 gallons of HOAT in is I drained the radiator by removing the lower radiator hose. This allows extra coolant to come out of the hoses and engine. I also made sure the overflow tank was empty. Then, when I refilled, I was able to get the 2 gallons in between the radiator and the overflow tank. In time, that overflow tank should circulate in with the rest of the coolant.


The other option is to have the dealer/mechanic flush it with a machine. Definitely easier as long as they use the correct coolant.
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Unread 01-11-2012, 07:59 AM   #12
Whybu1
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I have been running "universal" coolant in both my WJ and TJ without issue.
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