Montello Auto Repair

EVs don’t burn fuel, but they still generate heat, and they still need a way to move that heat around. Coolant is the A/C for the battery, power electronics, and drive unit, especially when the weather is hot or you’re fast-charging. If coolant service gets skipped, the car may seem fine for a long time, then start showing little changes that are easy to misread. Over time, those little changes can add up. EV Coolant Change Basics EV coolant is there to transfer heat and protect internal passages from corrosion. It circulates through tight channels, pumps, and heat exchangers that are designed around a specific coolant chemistry, not just any green bottle off the shelf. As coolant ages, additives that prevent corrosion and deposits gradually weaken. That does not always cause a sudden failure, but it can reduce the system’s margin when the vehicle is pushed harder. What Old Coolant Does In EVs Old coolant can carry fine particl ... read more