Mercedes W164 W166 W463 Thermostat Oil Cooler Housing OM651.960 A1645010265

Mercedes W164 W166 W463 Thermostat Oil Cooler Housing OM651.960 is a precision cooling system component designed for diesel engines, engineered to ensure stable operation of the power unit. As part of the Thermostats and housings group, it is responsible for the proper routing of coolant and interaction with the thermostat, which translates into a safe operating temperature for the diesel engine. This used OEM component is a sensible choice for maintenance or repairs when you want to maintain the factory characteristics of the cooling system.

Specifications and technical data

• SKU: A1645010265-3
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1645010265
• Substitutable numbers: A1645010265, A 164 501 02 65
• Fuel type: Diesel
• Part type: Thermostat Housing
• Category: Thermostats & Housings

Purpose and function in the cooling system

The thermostat housing in a diesel engine plays a key role in managing the flow of coolant between the engine block, the radiator, and other system components. In the OM651.960 units used in Mercedes W164, W166, and W463 series, it is responsible for:

• stable seating of the thermostat at the appropriate point in the cooling system,
• tight routing of coolant in the intended direction,
• cooperation with water channels in the cylinder head and engine block,
• maintaining the optimal operating temperature of the diesel engine. A correctly selected and functional thermostat housing helps reduce the risk of engine overheating or underheating, which has a direct impact on engine durability, fuel consumption, and smooth operation.

Benefits of using an original housing in a diesel engine

For modern diesel units, it is particularly important to maintain the factory geometry of the coolant flow. Using an original thermostat housing for a Mercedes ensures:

• precise fit to sockets and connectors in the cooling system, without the need for modifications,
• proper cooperation with the thermostat intended for the OM651.960 engine,
• preservation of factory heating and cooling parameters of the diesel unit,
• reduced risk of leaks at hose and connector joints. For users who care about predictable engine behavior and stable operating temperatures, choosing such a housing is a practical service solution.

Assembly characteristics and application

The thermostat housing is designed for systems powered by a diesel engine, which means it has been designed for the specific operating conditions of diesel units – higher thermal loads, longer duty cycles, and different heating characteristics. In practice, this translates into:

• compatibility with the cooling system intended for OM651.960 engines,
• the possibility of use in preventive repairs (replacement during thermostat service),
• application in situations where the existing housing has cracked, deformed, or corroded. The used OEM element allows for maintaining the factory assembly line and facilitates the mechanic's work – mounting points, connector diameters, and general geometry are consistent with the solution provided by the manufacturer.

Condition, origin, and identification parameters

The presented thermostat housing is a Mercedes part sourced from dismantling, offered as a used element. Thanks to this, it constitutes an economical alternative to new components while maintaining the original manufacturer's specification. The product has an assigned warehouse identifier, as well as a factory OEM part number and appropriate interchangeable numbers, which facilitates verification of compatibility with a specific vehicle configuration in service catalogs.

Support for selecting and expanding the cooling system

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as housings, inserts, or complete thermostat assemblies, check the available parts in the Mercedes Thermostats and housings category. For owners of older Mercedes models who want to consciously use used components while maintaining high vehicle performance, the following guide article may be helpful: The second life of a youngtimer – how used car parts rejuvenate cars from the 1998–2012 model years. There, you will find practical tips on planning upgrades, verifying part compatibility, and safely servicing vehicles using dismantled parts.