Dayco 87954 HVAC Heater Hose - Heater Outlet

Dayco Small I.D. Heater Hose for BMW

Dayco 87954 is a Small I.D. Heater Hose built for heater outlet service on select BMW applications. It uses EPDM construction with a black finish and a protective sleeve to support heat and abrasion resistance in the HVAC hose routing.

This Dayco heater hose is a dual I.D. design with 11/16 in. inside diameter at one end and 3/4 in. at the other, making it a direct replacement for specific BMW heater outlet connections. It is engineered to meet SAE J20R3 Class D-1 and SAE J1684 Type EC specifications.

Key Features

• Dayco 87954 Small I.D. Heater Hose for heater outlet applications
• EPDM hose material with black exterior
• Dual I.D. hose design: 11/16 in. x 3/4 in. inside diameter
• Protective sleeve included for added surface protection
• Built to SAE J20R3 Class D-1 and SAE J1684 Type EC standards
• BMW heater hose replacement for select 1 Series, 3 Series, 7 Series, and X1 models

Detailed Description

Dayco 87954 is part of the Small I.D. Heater Hose line, a product line focused on heater circuit routing where compact hose sizing and accurate end diameters matter. This hose is shaped for heater outlet use and is listed for multiple BMW platforms, including 2008-2013 BMW 128i, 135i, and 328i applications, as well as select 335i, 740i, 740Li, and X1 models. If you are sourcing a BMW heater hose replacement for a heater outlet connection, this part number provides the specified dual-diameter fitment and OE-style routing profile.

This part cross-references BMW 64.21.6.951.946 and Duralast E87954 for the same application. Dayco 87954 is a practical choice when replacing a worn or damaged heater hose on BMW 328i, 335i, or 135i vehicles where the original hose uses a small inside diameter connection.

What It Helps Address

• Cracked or aged heater hose material at the heater outlet
• Coolant seepage from a deteriorated hose connection
• Incorrect hose sizing during BMW heater hose replacement
• Heat-related wear in the HVAC hose routing
• Loss of heater circuit integrity caused by damaged hose ends

Installation Notes and Tips

Verify the end diameters before installation: 11/16 in. on one end and 3/4 in. on the other. Confirm the vehicle application by year, model, and heater outlet position before ordering. This hose is listed for select BMW 128i, 135i, 328i, 335i, 740i, 740Li, and X1 applications, so matching the original routing and connection size is important for proper fitment.

Quality Assurance

Dayco manufactures this hose to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications, supporting consistent material and performance requirements for HVAC heater hose service.