BMW M30 Thermostat Housing 11531250352 Early Version

Genuine BMW thermostat housing assembly for early M30 inline-six engines, with a casting date from approximately 1977/1978.

This complete used assembly includes the aluminum thermostat housing, early-style thermostat cover, and two installed temperature-related sensors/switches. The exact part numbers and operation of the installed sensors have not been verified.

Details

• Part: Thermostat housing assembly
• Manufacturer: BMW
• Manufacturer type: Genuine OEM/OE
• Engine family: Early BMW M30 inline-six
• Material: Cast aluminum
• Condition: Used – untested
• Approximate casting period: 1977/1978
• Housing casting number: 1 250 351.3
• Primary BMW housing number: 11531250352
• Included: Housing, thermostat cover, and two installed sensors/switches
• Supplied exactly as shown in the product photos

BMW Thermostat Housing Part Numbers

The number 1 250 351.3 cast into the housing is a casting number. The .3 identifies the casting revision and is not part of the orderable BMW part number.

The period-correct BMW part number for the housing is:

• 11531250352 — 11 53 1 250 352

Associated earlier, intermediate, and superseding BMW references include:

• 11531250352 — 11 53 1 250 352
• 11531263058 — 11 53 1 263 058
• 11531271475 — 11 53 1 271 475
• 11531272703 — 11 53 1 272 703
• 11531272870 — 11 53 1 272 870
• 11531278187 — 11 53 1 278 187
• 11531710959 — 11 53 1 710 959 — final superseding part number

BMW part number 11531250352 was used from approximately September 1968 until July 1981. It was later superseded by updated versions, with 11531710959 being the final replacement number.

Thermostat Cover Part Numbers

The early thermostat cover fitted to this assembly is associated with:

• 11531250356 — 11 53 1 250 356
• 11531714861 — 11 53 1 714 861 — superseding cover number

Related sealing components include:

• 11531250399 — thermostat O-ring for the early housing
• 11531275881 — vent screw

These related numbers are provided for reference. Only the components visible in the product photos are included.

Installed Sensors and Switches

Two period temperature-related sensors or switches are installed in the housing.

• Exact BMW part numbers: Not verified
• Condition: Used and untested
• Included: Yes, exactly as shown
• Operational condition: Unknown

The correct sensor configuration varies by model, production date, country specification, fuel-injection system, and wiring harness. Please compare the electrical terminals, threads, and physical design with the original components from your vehicle.

Vehicle Compatibility

Depending on production date and cooling-system configuration, this early thermostat housing was used on various classic BMW models equipped with an M30 engine, including:

• BMW E3: 2500, 2800, 3.0 S, 3.0 Si and 3.3 L/Li
• BMW E9: 2500 CS, 2800 CS, 3.0 CS, 3.0 CSi and 3.0 CSL
• BMW E12: 525, 528, 528i and 530i
• BMW E23: early 728, 730 and 733i models
• BMW E24: early 630 CS, 630 CSi and 633 CSi models

Later superseding versions of the housing were also used on selected M30-powered BMW E28, E32, and E34 models. However, the cover, sensors, switches, and connection configuration may differ. Do not assume direct compatibility with a later vehicle without comparing the complete assembly.

Condition

Used original BMW component in unrestored condition. The housing and cover show visible oxidation, surface discoloration, dirt, coolant deposits, corrosion, old gasket residue, and normal marks from previous installation and storage.

The housing, thermostat cover, sensors, switches, and internal thermostat have not been tested. The presence and condition of the thermostat inside the housing have not been verified.

Cleaning, disassembly, inspection, and installation with new seals are recommended before use.

Important Notes

• Genuine early BMW M30 thermostat housing assembly
• Housing casting number: 1 250 351.3
• Primary BMW part number: 11531250352
• Used and untested
• Two unidentified sensors/switches are included
• The presence and condition of the internal thermostat have not been verified
• Visible oxidation, corrosion, deposits, and installation marks are present
• Clean and inspect all threaded ports and sealing surfaces before installation
• Always install using the correct new gasket and O-ring
• Compare the housing, cover, hose connections, sensor configuration, and electrical terminals with your original assembly
• If you are unsure about compatibility, please contact us with your VIN, production date, and photos of your original thermostat housing
• Rare genuine BMW component suitable for an OEM-correct restoration