BMW M340i Radiator Hose Replacement Cost

There are two radiator hoses. The upper radiator hose carries hot coolant from the thermostat housing on the engine to the radiator inlet. After the coolant passes through the radiator and sheds excess heat, the coolant exits the bottom of the radiator into the lower radiator hose, bringing the cooled fluid back to the engine.

A coolant leak may be noted from the hoses. Coolant hoses can be damaged by oil leaks, or age. This will lead to swelling or cracking, it is suggested to replace the hoses before they begin leaking to avoid potential overheating.

The vehicle should not be driven with leaking or damaged radiator hoses. If a hose should fail while driving, the engine would overheat in short order, leading to additional repair expense. Get this fixed by a RepairPal Certified Shop

Replacement intervals vary greatly by vehicle and driving conditions. The radiator hoses do not wear like a tire or a ball joint, but eventually the rubber will degrade to the point of leakage. If not from age, the hoses will often fail due to oil contamination from an oil leak. Oil leaks cause the rubber to swell and weaken, increasing the risk of failure.

The hoses can be visually inspected for leakage, cracking, or swelling. A pressure test may also be performed to ensure the system is sealed. The technician will also physically check the hoses for feel, an overly soft hose is often contaminated with oil and more likely to fail.

The technician will drain the cooling system as necessary and remove the hose. An inspection of the radiator neck or thermostat housing it is attached to will be performed. The new hose will be installed with new hose clamps before the system is refilled with fresh coolant, bled of any air, and checked for leaks.

Hoses will often be stuck to their attachment points. When removing them from thermostat housings and radiators, it is important to take care not to apply too much force as it can damage plastic fittings on otherwise fine components. To prevent cracking plastic attachment points, there are special pick-like tools that can aide removal.

There are many aftermarket or universal radiator hoses that are cheaper than the OEM hoses or their equivalents. It is important to order the correct, high-quality hose to ensure a longer lasting repair. While more affordable, the cheaper hoses may be of inferior construction, incorrect shape, or missing provisions for the expansion tank and other cooling outlets. Ill fitting and low quality hoses increase the risk of coming off or collapsing, causing overheating and subsequent engine damage. If a hose has to be modified to work, it is the wrong one.

Repairing your own car is an extremely rewarding process that can also save you money. But before you dive in, it’s important to be sure the issue has been properly diagnosed. Seemingly obvious symptoms can lead the inexperienced down a rabbit hole of replacing parts that don’t fix the problem. Proper diagnosis can save more money than guessing at what’s broken! If you're unsure you have the right tools or experience to diagnose a problem, consider reaching out to a RepairPal Certified Shop. The vast majority of radiator hoses only require simple tools to replace. However, the procedures vary wildly from car to car. Before ordering parts or attempting this repair yourself, look online for guides on how to replace the radiator hoses in your specific vehicle. On some cars, removal of the front bumper or special tools to release hose clamps in tight places may be required. Some vehicles also require special cooling system filling and bleeding procedures.