How to Check and Replace the Coolant Reservoir in a Hyundai Elantra Maintaining the coolant reservoir in your Hyundai Elantra is an important part of keeping your vehicle running smoothly. The coolant reservoir holds the engine coolant, which helps to regulate the temperature of the engine and prevent it from overheating. If you notice that your Elantra’s coolant reservoir is cracked or leaking (which might cause issues such as your engine smoking but not overheating), it’s important to replace it …
