The hoses and pipes in BMW’s cooling system serve as the "circulatory network" that regulates the engine’s optimal operating temperature, playing a critical role in coolant transfer and heat dissipation. Below is a detailed overview of popular models, including their core functions, compatible components, and key features:
Core Functions & System Role
Hoses and pipes in the cooling system are responsible for circulating coolant (a 50/50 mix of antifreeze and water), fulfilling three vital purposes:
- Heat Transfer: Channel excess heat from the engine block (operating temperature: 80–110℃) to the radiator, where it is dissipated into the ambient air via cooling fins.
- Circulation Integrity: Link key components such as the expansion tank, water pump, and engine water jackets to form a sealed loop, ensuring coolant flows steadily under 1–1.5bar of pressure.
- Temperature Regulation: Work in tandem with the thermostat to restrict coolant flow to the radiator during cold starts (accelerating engine warm-up) and open fully once operating temperature is reached (preventing overheating).
| Part Number | Product Name | Compatible Components |
| 1712 7619 684 | Coolant Hose | Engine to radiator/water pump |
| 1712 7531 768 | Radiator Upper Hose | Radiator top to engine outlet |
| 1712 7640 917 | Expansion Tank Hose | Expansion tank to main circuit |
| 1153 7603 514 | Coolant Hose | Heater core to main circuit |
| 1712 8602 599 | Expansion Tank Hose | Expansion tank to return line |
| 1712 8602 870 | Radiator Upper Hose | Radiator to thermostat housing |
| 1712 7578 399 | Coolant Hose | Water pump to engine water jacket |
Frequently Asked Questions (FAQ)
Q1: How to determine if the thermostat is faulty?
A1: A thermostat failure usually causes the following symptoms:
Engine overheating: The thermostat is stuck in the closed state, preventing the coolant from entering the radiator.
Slow engine heating: The thermostat is stuck in the open state, and the coolant is always circulating, causing the engine to be unable to reach normal operating temperature for a long time.
Increased fuel consumption: The engine does not work at the optimal temperature, the combustion efficiency will be reduced, resulting in increased fuel consumption.
Q2: What should be paid attention to when replacing the LR062498 thermostat?
A2: It is recommended to be replaced by a professional technician, and pay attention to the following points:
Operate when the engine is cold to prevent burns.
Drain the old coolant correctly.
Make sure the seal is installed in place during installation to prevent coolant leakage.
After replacement, the cooling system needs to be vented to prevent "air blockage" from affecting the cooling effect.
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