Genuine BMW M30 Thermostat Housing with 3 Sensors (11531710959)

Original BMW aluminum thermostat housing for M30 inline-six engines. This is a used housing with four threaded sensor ports. Three used temperature sensors/switches are installed, while the fourth port has been closed with a bolt.

The housing carries casting number 1 250 351.9. This is a casting number and should not be confused with the complete BMW catalog part number.

Because BMW used different sensors, switches, plugs and electrical connectors depending on model, market and production date, buyers should carefully compare the complete housing configuration before ordering.

Details

• Part: Thermostat housing
• Manufacturer: BMW
• Manufacturer type: Genuine OEM
• Engine family: BMW M30 inline-six
• Material: Aluminum
• Condition: Used
• Casting number: 1 250 351.9
• Threaded sensor ports: 4
• Installed sensors/switches: 3
• Remaining port: Closed with a bolt
• Supplied exactly as shown in the photographs

BMW Thermostat Housing Part Numbers

The number 1 250 351.9 cast into the housing is a production casting number. The associated BMW thermostat-housing numbers 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

The principal documented replacement sequence is:

11531250352 → 11531272870 → 11531278187 → 11531710959

The remaining numbers are related catalog variants. Interchangeability can depend on the vehicle, production date, hose arrangement and required sensor configuration.

Included Temperature Sensors and Switches

Three used temperature sensors/switches are installed and included with the housing.

Their markings and BMW part numbers cannot be read clearly from the photographs. Based on their connector designs and commonly used BMW M30 configurations, possible references include:

• 13621357414 — 13 62 1 357 414
  Coolant temperature sensor, specification 20°C / 2500 ohms
• 13621362599 — 13 62 1 362 599
  Temperature-time switch, replacing earlier number 13621274630
• 62161360870 — 62 16 1 360 870
  Temperature sender/warning contact, 120°C

These sensor identifications are possible references only and are not guaranteed. The supplied sensors have not been individually identified or electrically tested. Compare the terminals, thread sizes and markings with the components required for your vehicle.

Vehicle Compatibility

The BMW thermostat-housing family is cataloged for various classic BMW models with M30 engines, including:

• BMW E3: 2500, 2800, 3.0 S, 3.0 Si, 3.3 L and 3.3 Li
• BMW E9: 2.5 CS, 2800 CS, 3.0 CS, 3.0 CSi and 3.0 CSL
• BMW E12: 525, 528, 528i, 530i and 535i
• BMW E23: 728, 728i, 728iS, 730, 732i, 733i, 735i and 745i
• BMW E24: 628 CSi, 630 CS, 633 CSi and 635 CSi
• BMW E28: 525i, 528i, 533i, 535i and M535i
• BMW E32: 730i, 730iL, 735i and 735iL with M30 engine
• BMW E34: 530i and 535i with M30 engine

This list describes the broader housing family. The installed four-port sensor arrangement is not automatically correct for every listed model.

Condition

Used original BMW component with visible age-related wear, oxidation, dirt, coolant residue and installation marks. It has not been refurbished.

The housing, threads, sensors and bolt-sealed port should be inspected, cleaned and tested before installation.

Important Notes

• Compare all BMW numbers, hose outlets and mounting points before ordering
• Check all four threaded ports and their thread sizes
• Verify the three sensor connectors against the vehicle wiring harness
• The exact sensor part numbers and electrical operation have not been confirmed
• Inspect and reseal the bolt closing the fourth port before installation
• Installation with new sealing rings and gaskets is recommended
• Thermostat, housing cover, gaskets and additional hardware are included only when visible in the photographs
• Professional installation is recommended
• Original BMW component, suitable for restoration, replacement or spare-part use