Last post on Oct 18, 2006 at 8:06 PM
You are in the Dodge Dakota Owners-Archived Discussions
What is this discussion about?
Dodge Dakota, Truck
#2459 of 4362 "Green" antifreeze..............
Nov 02, 2003 (7:45 am)
jhorl, you must be careful of making assumptions based on the color of the coolant. My 2003 Dakota also has a green-colored coolant, but it is definitely HOAT - Hybrid Organic Additive Technology. This is available from Chrysler or Dodge dealers as Mopar # MS-9769 (Mopar Antifreeze/Coolant, Five-year/100,000 Mile Formula). Chrysler appears to be unique in the industry at this time by using hybrid coolants in some of their vehicles. Most manufacturers are using either straight OAT or ethylene-glycol based coolants.
Based on what I've read, Dodge trucks have been using the HOAT coolant since 1998 or before. The 4.7 in particular was designed around the use of a HOAT coolant.
Whatever and where ever I've read anything on the subject the great precaution is to never mix types. Some coolant system seals and other materials are not compatible with either type. If you are unsure, contact your (or a) Dodge dealer and ask. I believe they might have a list of which Chrysler-built vehicles need which type, since they do the same time for ATF.
The Mopar HOAT is conservatively rated to go 5 years or 100,000 miles in a system that is properly maintained, including using only distilled water as Bpeebles mentioned in an earlier post. However, once contaminated with another type, some believe that only extensive flushing will render the system neutral enough again to return to HOAT.
#2460 of 4362 "Green" Coolants (addendum)
Nov 02, 2003 (7:50 am)
Oh, the usual mix for ethylene-glycol based coolants is 50% with water. Chrysler HOAT is 55-60%.
#2461 of 4362 "Green" antifreeze..............
Nov 02, 2003 (8:44 am)
(dustyk) You Re correct that only Dodge is using HOAT and it is only available from them. (No one else uses the HYBRED OAT)
You are mistaken about the 4.7L V8 always using HOAT. I have the Dodge shop manual (BOB=BigOrangeBook)that I purchased wiht my 2000 Dakota.
On page 7-29, under "REFILLING 4.7L ENGINE" it SPECIFICALLY says to use "50/50 mixture of ethylene-glycol antifreeze and low-mineral content water"
It cannot be said enough times that MIXING the differnt kind of antifreezes will damage your engine. Excessive corrosion and gell plugging up the small passageways is the reason.
#2462 of 4362 Bpeebles............
Nov 02, 2003 (1:42 pm)
Well, you might be correct, although I thought I had read that the 287 motor was designed around HOAT. But at my age, like a number of other body functions, the memory isn't what it use to be.
Yeah, my 2003 Dakota manual is confusing in this area, too. Like your manual, mine says the same thing on page 7-14 (Standard Procedure - Refilling Cooling System, 4.7 Engine). And like yours it says to "use 50/50 mixture of ethylene-glycol antifreeze and low-mineral content water."
But in the Lubrication & Maintenance section (page 0-4), the service manual then states in "COOLANT SELECTION AND ADDITIVES:"
"The use of aluminum cylinder blocks, cylinder heads, and water pumps requires special corrosion protection. Mopar AntiFreeze/Coolant, 5 Year/100,000 Mile Formula (MS-9769), with organic corrosion inhibitors (called Hoat) is recommended. This coolant offers the best engine cooling without corrosion when mixed with 50% distilled water to obtain a freeze point of -37C. If it loses color or become contaminated, drain, flush, and replace with fresh properly mixed coolant solution."
I suspect that the manual might be suffering from inadequate editing. The basic service manual format in many areas has been written and used for many years. Newer manuals use previous editions as a boilerplate then edit out old or incorrect information and add newer information. This appears to be an area that got missed since I know that in 2003 every Dakota engine used HOAT.
Nov 02, 2003 (3:18 pm)
Now you got me thinking... I just did an antifreeze change in my 2000 Dak. I did not put much effort into draining all of the old stuff. (would have to remove radiator and hose it out to do that)
I used about 1.5 gallons of 50/50 ethylene-glycol. I sure hope I have not mixed this with HOAT.. .that may not be good for my cooling system.
#2464 of 4362 bpeebles
Nov 02, 2003 (4:13 pm)
I'm also feeling a bit worried about my recent job. I looked into the overflow tank and saw a funky frothy thick substance floating on top after I completed the job. I may be doing a complete flush very soon.
#2465 of 4362 Bpeebles............
Nov 02, 2003 (4:27 pm)
Else where in the 2003 Dakota manual, it says that the coolant reserve cap will indicate what type of coolant receipe to use. It's 0-dark hundred here in Rochester, NY. I'll check this on mine tomorrow.
#2466 of 4362 Antifreeze
Nov 02, 2003 (4:37 pm)
Just got this off of Valvoline website. It states that the HOAT was factory installed on 2001 and newer. It also states that it is orange in color. I hope I'm safe here.
What vehicles use Zerex G-05 in the factory fill and what is the dye color?
1984 Mercedes and beyond (light yellow)
1990 Deere and Company vehicles and beyond (green)
2001 Chrysler, Dodge, and Jeep and beyond (orange)
2002 Ford, Lincoln and Mercury trucks and SUVS and beyond (yellow)
2003 Ford, Lincoln, and Mercury automobiles and beyond (yellow)
Nov 02, 2003 (5:32 pm)
(jhorl)Its not that easy.... only DODGE TRUCK uses GREEN HOAT. (other companies use OAT which is orange)
My Volkswgen uses PURE OrganicAcidTechnology and it is Florecent PINK colored. This stuff is only manufactured in Germany. (There is no substitute)
Fortunatly, the PINK VW stuff is one of the best on the planet and should last the life of the vehicle.
Nov 02, 2003 (5:38 pm)
I just checked the dipstick on the resouvouir tank and the holes to indicate proper level were all clooged up with a white gel like substance. I'm not feeling too good about this right now.