Users manual for the 5.7 calls for HOAT (Hybrid Organic Acid Technology) type antifreeze. (labeled as G05 for Zerex/Valvoline brand)
Bought my GC used and I've heard that when the HOAT type is mixed with non-HOAT type antifreeze that the two will react and coagulate and curdle.
Since I bought used there is a small chance that the PO put a non-HOAT type in (assuming that it's been swapped out before). My question is for those who still have the original fluid from the dealer in. Is it ORANGE? I suspect mine is original and it's ORANGE. GC is 05
The color of the coolant isn't diagnostic of the type. My 08 Jeep (original coolant) has a pink color. My Crossfire (also HOAT) has aqua-blue coolant. The Zerex G05 is yellow.
Just to be safe, I would flush the cooling system with distilled water and be sure that the coolant in your Jeep is HOAT. It would be money well spent to know that you are using the correct coolant and to then know when to replace it again.
I've done quite a few DIY cooling systems flushes in the past 20 years, so here's what I suggest:
1. Get a back flush kit from any auto parts supply store;
2. Get the right coolant - Jeeps apparently require HOAT-type antifreeze, so buy the Mopar stuff from a dealer or get Zerex G05 from NAPA (online or at the store);
3. Get a coolant system cleaner if needed. If the wrong coolant was used or you aren't certain what you have in your system now, doing a thorough cleaning and back flush before adding the new coolant will allow you to start with a clean slate. If you're seeing gunk and crud floating in the current coolant, you should consider replacing all coolant hoses (If you doo an Internet search on the topic you'll see why this may be necessary).
4. Do the back first flush following the directions that come with the kit. If you opt to clean the system first, you'll have to follow the directions for using the cleaner which usually require you leave it in for 3 hours of operation.
5. Once flush is complete, add new coolant. If using undiluted coolant, you'll have to do a 50/50 mix using distilled water (Walmart is a good place to pick up a few gallons)
Tips - If you use regular tap water to do the system flush you may want to pick up a few gallons of distilled water to do a final system flush with this to enusre there are no mineral deposits left behind.
Make sure you dispose of the used coolant properly.
Mopar coolant (factory and parts counter) is dyed kind of an orangey-red-pink. Valvoline officially calls it "orange."
My '05-built '06 was orange. Slightly less now after flushing it out for fresh.
Just bought HOAT at the dealer. It's the MOPAR orange stuff that meets the MS-XXXX Chrysler spec. Needed it to top off my overflow tank.
Interesting point is that their gallon jug is NOT diluted to 50% anti-freeze/water. It was $18, but equivalent to 2 gallons of the pre-mixed stuff.
HEMI CLUB MEMBER #45; SILVER WK CLUB MEMBER #13
'08 WK GC Limited. 5.7L HEMI. Quadra-Trac II. Bright Silver Metallic. Class IV hitch.
Michelin LTX M/S tires. Fumoto oil drain valve. Billet Technology oil catch can.
I was lazy a few weeks ago and decided to go get an oil change at a place near my house...they give you a free carwash with the oil change so I went for it. Anyway, I'm sitting in the lobby and the mech calls me in to go over the car. He said everything looks good, except that my coolant was orange. I told him it's supposed to be orange...it's always been orange. He asks "Are you sure? It's supposed to be green." I looked at him and told him to finish up and give me my car back.
Yep did the dumb thing and topped off my WK with NON-HOAT ( 1/2- 1 gallon).... so I guess that means I get to do a fluid flush this weekend?????
Can't wait to get started, but my wallet can......
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94ZJ 5.2 Red; Rusty's 3" Coils,Skyjacker hydro's, Brush Guard, Custom Rear Bumper, Custom Roof Rack, KVG Quick Discos, 31-10.50-15's DAYTON TIMBERLINE A/T OBA 2 Gallon tank
Can't buy it? BUILD IT!! Do it cheap too cuz your in college
Ford and Chrysler vehicles. Here again, it's a no-brainer. Both companies have identified problems with DexCool, so use something else. G-05 is available in the aftermarket, so that's your choice for extended life on vehicles from those makers. However, if your second coolant is conventional American, that's fine. The recommended service interval is shorter, but if the coolant level is maintained and the motorist is not a high-mileage driver, it can serve beyond two years. In fact, Ford long recommended four-year intervals with conventional American coolant.
Pretty old article however...
I have green stuff. Does that mean I have the wrong stuff. I've had it for two years with no problems.