2013 Chevrolet Volt Owner Manual - Page 264

10-16 Vehicle Care The coolant needs to be replaced at the appropriate interval. See Maintenance Schedule on page 11‑3. Check to see if coolant is visible in the power electronics and charger modules coolant reservoir. If coolant is visible but the coolant level is below the cold fill line, there could be a leak in the cooling system. The power electronics and charger modules coolant should only be serviced by a qualified technician. Cooling System (Power Electronics and Charger Modules) The power electronics and charger modules are cooled using the same coolant loop. The power electronics and charger modules in the vehicle are kept below a maximum temperature. If the temperature rises above this temperature, the electric cooling fans will turn on and cool the coolant until the correct temperature is reached. Checking Coolant The vehicle must be on a level surface when checking the coolant level. The power electronics and charger modules coolant reservoir is located in the engine compartment. See Engine Compartment Overview on page 10‑8. Engine Coolant The engine cooling system in the vehicle is filled with DEX-COOL engine coolant. The coolant needs to be replaced every 5 years or 240 000 km (150,000 mi), whichever occurs first. The following explains the cooling system and how to check and add coolant when it is low. If there is a problem with engine overheating, see Engine Overheating on page 10‑19. What to Use The power electronics and charger modules coolant reservoir in the vehicle is filled with a 50/50 mixture of DEX-COOL engine coolant and deionized water. If using this mixture, nothing else needs to be added.