![]() Confirm the recommended coolant type for your engine and situation. See a purple coolant in the reservoir? This could be a mix of two different coolant types.Ī good place to start is with the engine manufacturer. These issues create difficulties in identifying what is being used especially because color is not a clear guide. New, old, mixed, or single OEM – you are almost guaranteed that coolant top-offs are happening outside of regular maintenance schedules. However, with mixed fleets and older fleets, you could see a variety of coolants being used. With single OEM fleets, it may be easier to identify coolant because a consistent manufacturer recommended coolant is being used. If two red coolants of differing blend are mixed, it can significantly reduce engine protection with not enough of the right additives left in the mixed formulation to protect against corrosion. Mixing a green (IAT) with an orange (OAT), for example, can cause a brown gel-like sludge to form which can block the cooling system over time.Ĭonsider also red coolants (OAT, HOATs and NOATs) – these can be both nitrite and nitrite-free blends. Mixing coolants can cause chemical reactions in the coolant reservoir. Color: typically, yellow or orange, but can also be pink, purple, and blue.Īs you can see, color is not always the best indicator of the type of coolant within a cooling system. Hybrid Organic Acid Technology (HOAT): These coolants combine the best of IAT and OAT products offering corrosion resistance for aluminum parts and rustproofing for iron components. ![]()
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