#Difference between oat and hoat coolant manual

They don't necessarily contain the same organic acids. How does mixing one chemical (HOAT) with another chemical (OAT) when both contain the same (OAT) coolant cause problems? In my 2018 Caravan it says OAT only coolant only because of material changes somewhere in the system.įurther I did this myself and drove 1,000km (600 miles) which is more than enough time for the radiator to expand into the overflow bottle and then suck back this mixture into the system as it cooled down and my Journey had no issues. There is OAT in both Mopar formulations of HOAT/OAT so it makes no sense that HOAT wouldn't be compatible with OAT in terms of mixing them together accidentally (not in terms of cooling system material compadibility.) In the 2012 Caravan it says you can use HOAT or OAT coolant but that it was originally filled with HOAT, it makes no mention of having to completely eliminate one coolant by flushing before adding the other either. I would argue (not with you demarpaint) but with the forums that either we aren't getting the whole story or they are embellishing the story in this instance because of something stupid they did and didn't want to admit to like using some one size fits all coolant that claims to meet the OAT spec or some cooling system additive. Even if some of it was sucked into the system. How does mixing one chemical (HOAT) with another chemical (OAT) when both contain the same (OAT) coolant cause problems? If the whole system was filled sure because the HOAT isn't compatible with materials in the system and over a period of time can cause a problem but the small amount added by by topping off the overflow bottle isn't enough over the gallons of fluid in the whole system to cause any problem if he simply empties out the overflow bottle and refills it with OAT. You are good to go, just dump the overflow bottle and refill. Also doesn't help that it looks orange as your are pouring it but purple in the overflow bottle. It was stupid of Mopar to use the same colour for both HOAT and OAT when they sound similar and could easily be mixed up. (Again a little won't hurt anything, but refilling the entire system with HOAT will not have the same anti-corrosive effectiveness over time, you won't end up with Dexcool type sludge or anything though) OAT coolant can be used in place of HOAT but HOAT can't be used in place of OAT. The coolants are compatible with each other but the problem is HOAT can cause problems in OAT only systems if used instead because of it reacting with materials found in the cooling system if you were to fill the entire system with HOAT. I did drive about 1,000km (600 miles) with it that way though. I just poured out my bottle and refilled with OAT and it was fine.

#Difference between oat and hoat coolant manual

I accidentally did the same thing to my Journey as I had left over HOAT from my dad's 2012 Caravan which required HOAT and I poured that into my Journey overflow bottle when it was low and then read the manual and realized I goofed because my Journey took OAT. That's not enough HOAT to cause any problems. If you just topped off the overflow bottle you are fine, but I would pull up on the overflow bottle which just sits in slots on the radiator, disconnect the hose going to the Rad-Cap neck and pour out the bottle and then refill with OAT.