Original BMW Rear Cylinder Head Coolant Hose Flange for BMW 3 Series, 5 Series, M3, and Z3 (1991–2000)

Attached to the rear of the cylinder head, the Original BMW coolant hose flange 11-12-1-717-432 is the fitting where the rear radiator coolant hose connects on the M50, M52, S50, and S52 inline six-cylinder engines in the E36 3 Series, E34 and E39 5 Series, and Z3 from 1991 to 2000. BMW names it simply the flange, and its parts data shows production from September 1989. It is sold as a single piece. A coolant flange gives a hose a rigid, sealed connection point on the engine, with a gasket between the flange and the head.

Original BMW Parts carry a 24-month parts warranty.

The flange is shared across a long run of BMW straight sixes. BMW's parts data shows it on the E36 3 Series with the M50 (325i and 325is) and M52 (323i and 328i), the E36 M3 with the S50 and the 3.2-liter S52, the E34 525i with the M50, the E39 528i with the M52, and the Z3 2.8 and Z3 M 3.2. The 525i applications span both the M50 and the later M50TU engines, in sedan and wagon form, with manual and automatic transmissions. BMW pairs this part with water flange gasket 11-12-1-738-963, which seals the flange to the head and is sold separately.

Technical Details

• Manufacturer: BMW (Original BMW part)
• Part number: 11-12-1-717-432
• BMW part name: flange
• Position: rear of cylinder head, rear radiator coolant hose connection
• Sold as: one piece
• Production start: September 1989
• Related part: water flange gasket 11-12-1-738-963
• Engines: M50, M50TU, M52, S50, and S52
• Warranty: 24-month Original BMW parts warranty

Common Questions

Does the flange come with a gasket?
No. The flange is sold on its own; the water flange gasket is a separate part, 11-12-1-738-963.

Is it the same flange on the M50TU 525i as on the earlier M50?
Yes. The 525i from 1991 through 1995 uses this flange with both the M50 and the M50TU engine.

PMB carries Original BMW cooling parts for the E36, E34, E39, and Z3.

Fitment & Compatibility

Use the table below to verify the year and submodel for your build. PMB Performance has spent over 20 years matching parts to vehicles and can verify this against your VIN.