Engine Coolant Line BMW E82 E90 E91 E92 LCI Heater Return-Thermostat 7552409

Engine Coolant Line BMW E82 E90 E91 E92 LCI Heater Return-Thermostat is an original cooling system component designed for BMW 1 and 3 series models. Thanks to its factory-spec geometry and precise fit for specific body generations, it ensures stable coolant flow and proper integration with other engine components. It is a practical solution for users who want to maintain the structural integrity of the cooling system in their BMW.

Specifications and technical data

• SKU: 7552409
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 17127552409
• Substitutable numbers: 17127552409, 7552409, 7548210, 17127548210
• Category: A/C Hoses & Fittings

Technical characteristics and purpose

The presented water pipe is a component of the engine cooling system, responsible for the precise routing of coolant between individual sub-assemblies. The hose construction has been designed for specific variants of the BMW E82, E90, E91, and E92, which translates into proper positioning in the engine bay and no interference with other equipment components. The appropriately selected cross-section and shape of the hose promote stable fluid flow, which is important for uniform heat dissipation from the power unit.

Benefits of using an original hose

Using an original coolant hose in a BMW E8x/E9x series allows for maintaining factory operating parameters. In practice, this means:

• secure fit to the mounts and connectors in the engine and radiator,
• preservation of the fluid flow path designed by the manufacturer,
• reduced risk of leaks resulting from imprecise fitment,
• easier installation compared to aftermarket replacements with universal geometry.

For the user, this translates into stable cooling system operation and a lower risk of engine overheating in both city and highway conditions.

Component condition and service application

The offered hose comes from dismantling and is marked as a used original BMW component. Such components are frequently chosen by service centers specializing in the brand when the priority is to maintain factory quality while optimizing repair costs. The water pipe will work well both for standard replacement of a worn hose and for comprehensive cooling system maintenance after a failure or engine equipment upgrade.

Integration with air conditioning and cooling systems

The product belongs to the Air conditioning lines, hoses, and connectors group, which emphasizes its role in the broader temperature management system of the vehicle. A properly functioning engine coolant hose supports the maintenance of stable operating conditions for the power unit, which indirectly affects the efficiency of the air conditioning and other temperature-dependent systems. Replacing a worn or leaking hose is an important step when diagnosing problems with overheating, cooling performance drops, or the presence of fluid leaks.

Installation recommendations and part selection

Before installation, it is recommended to verify the compatibility of the hose with the specific engine and body version of the BMW E82, E90, E91, or E92, as well as to check the condition of cooperating elements – connectors, clamps, and adjacent hoses. Replacing the hose is a good time to flush the cooling system and use fresh fluid with the parameters recommended by the manufacturer. This allows you to fully utilize the potential of the newly installed component and reduce the risk of repeated service interventions.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as coolant lines, return hoses, or cooling system connectors, check the available parts in the BMW air conditioning lines, hoses, and connectors category.

For drivers considering an economical approach to servicing premium vehicles, it is worth checking out the tips on selecting used OEM components – they are discussed in detail in the article Used parts for Mercedes - original parts from dismantling, which shows how to consciously use components from dismantling while maintaining high repair quality.