Section 20 (Cooling System): Operation
WARNING: This page is about a different car, the 2022 RAM ProMaster 3500, 2022 RAM ProMaster 2500, and 2022 RAM ProMaster 1500. However, it is still accessible from the selected car via links, so may be relevant.
| 1 - RADIATOR |
| 6 - REAR HEATER CORE |
| 2 - RIGHT CYLINDER HEAD |
| 7 - FRONT HEATER CORE |
| 3 - THERMOSTAT |
| 8 - OIL COOLER |
| 4 - WATER CROSSOVER |
| 9 - WATER PUMP |
| 5 - LEFT CYLINDER HEAD |
| 10 - CYLINDER BLOCK |
The engine cooling systems primary purpose is to maintain engine temperature in a range that will provide satisfactory engine performance and emission levels under all expected driving conditions. It also provides hot coolant for heater performance. It does this by transferring heat from engine metal to coolant, moving this heated coolant to the radiator, and then transferring this heat to the ambient air.
- When engine is cold: Thermostat is closed, cooling system has no flow through the radiator. The coolant bypass flows through the engine only.
- When engine is warm: Thermostat is open, cooling system has bypass flow and coolant flow through radiator.