When an electric vehicle alerts low coolant level, some mechanics grab ordinary antifreeze they use for gasoline cars and top it off directly. This quick fix will lead to expensive battery pack damage. Regular engine antifreeze and EV battery coolant are not interchangeable, even if they look similar in color. Our coolant factory reminds all distributors and fleet partners to separate these two products strictly.
Regular engine antifreeze is designed for combustion engine working conditions. Its main tasks are preventing freezing in winter, raising boiling point under engine heat, and forming anti-corrosion film on cast iron, aluminum engine blocks. Its additive package contains ionized corrosion inhibitors, which work well for low-voltage engines but are not suitable for high-voltage battery packs.
EV battery cooling coolant is built around high-voltage safety first. Its formula removes excess ionized additives to keep conductivity low. It focuses on stable heat transfer within a mild temperature range for lithium batteries, rather than resisting extreme engine combustion heat. The anti-corrosion additives selected will not introduce extra conductive ions into the cooling circuit.
Mixing these two fluids triggers a series of negative reactions. The ion-rich additives from regular antifreeze will push conductivity far above the safe limit. Chemical incompatibility may create solid sediment that blocks narrow cooling channels inside the battery pack. It will erode the insulating coating of cooling plates and trigger insulation fault alarms, which can void the vehicle warranty.
Repair shops and distributors should manage inventory separately and cooperate with a professional EV coolant supplier. Clearly label the storage barrels and bottles. Train service teams to identify EV thermal fluid and engine antifreeze. A responsible manufacturer will provide product training materials to help your team avoid this costly mistake.
If mixing has already happened, draining and simple topping-up is not enough. The whole cooling circuit needs full flushing with dedicated cleaning fluid, then vacuum filling with matching EV coolant. You must re-test insulation and conductivity after the service before returning the vehicle to service. Partial draining will leave residual mixed fluid and hidden risks.
Q1: Why do regular antifreeze and EV coolant look the same color? A: Dye is only for visual identification and has no connection with conductivity or formula. Manufacturers add similar colored dyes for easy leak detection. Never judge whether a coolant is suitable for EV battery just by its color.
Q2: Will a small amount of mixed antifreeze damage the battery right away? A: It may not fail immediately, but the risk starts once mixed. Even a tiny volume of conventional antifreeze will raise conductivity gradually. The hidden fault may show up after weeks or months, leading to expensive battery pack repair.
Q3: Can I flush the EV cooling system with tap water? A: No. Tap water contains massive mineral ions, which will make conductivity spike. Only deionized water or dedicated EV cooling system flush fluid approved by your coolant manufacturer can be used for cleaning.
Q4: Are all EV coolants compatible with each other? A: Not all EV coolants are interchangeable. Different brands adopt different inhibitor systems. Mixing two different EV coolants may produce sediment, block tiny cooling channels and break the low-conductivity property. Stick to one specified coolant.
Q5: Does EV coolant need a special filling tool? A: Yes. EV high-voltage cooling loops require vacuum filling tools to remove air bubbles. Air pockets will cause uneven heat transfer and accelerate coolant degradation. This tool is standard equipment for professional EV repair workshops.
Q6: Will mixing antifreeze void my EV manufacturer warranty? A: In most cases, yes. If the inspection report finds incompatible coolant inside the battery cooling loop, the automaker can reject warranty claims for battery damage caused by fluid mismatch.
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peter
ZHEJIANG GAFLE AUTO CHEMICL CO.,LTD
Tel:86-579-8222 1665
Fax:86-579-8246 4690
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E-mail:peter@gafle.net
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