Dayco 88504 HVAC Heater Hose - Engine To Valve or Valve To Engine

Overview of Dayco Small I.D. Heater Hose 88504

The Dayco Small I.D. Heater Hose 88504 is designed for reliable HVAC performance in select BMW models. Engineered with durable EPDM material, this dual inside diameter hose ensures efficient coolant flow and heat transfer within the heating system.

• Constructed from high-quality EPDM for heat and chemical resistance
• Dual inside diameters: 5/8 inch and 13/16 inch for precise fitment
• Black color for standard OEM appearance
• Complies with SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Trunk height of 20 1/2 inches for proper routing
• Designed without heat shield or protective sleeve

Details on the Small I.D. Heater Hose Product Line

The Small I.D. Heater Hose line by Dayco focuses on providing hoses with varying inside diameters to accommodate specific HVAC system requirements. This product line is tailored to meet OEM standards for heater hoses, ensuring compatibility and durability in automotive heating applications. The 88504 part number represents a dual inside diameter hose that fits select BMW vehicles, offering a precise replacement option within this product range.

Technical Description and Compatibility

The Dayco 88504 heater hose is constructed from EPDM, a synthetic rubber known for its resistance to heat, ozone, and coolant chemicals, making it suitable for HVAC systems. The hose features two different inside diameters—5/8 inch on one end and 13/16 inch on the other—allowing it to connect components with varying sizes. Its outside diameters measure 1 13/32 inches and 1 3/32 inches respectively. This hose does not include a heat shield or protective sleeve, which is consistent with many OEM heater hose designs. It meets SAE J20R3 Class D-1 and SAE J1684 Type EC standards, ensuring compliance with industry requirements. This part is compatible with BMW 3 Series models including 323Ci, 323i, 325Ci, 325i, 325xi, 328Ci, 328i, 330Ci, 330i, and 330xi.

Common Applications and Problem Solving

• Replacement of worn or cracked heater hoses in BMW 3 Series HVAC systems
• Resolving coolant leaks that cause insufficient cabin heating
• Addressing hose swelling or softening due to heat exposure
• Preventing coolant contamination from degraded hose material
• Ensuring proper coolant flow for consistent heater core performance

Installation Notes and Tips

When installing the Dayco Small I.D. Heater Hose 88504, ensure the correct orientation of the dual inside diameters to match the vehicle’s HVAC connections. Inspect hose clamps and replace if necessary to maintain a secure seal. Avoid twisting or kinking the hose during installation to preserve flow integrity. Verify that the hose routing matches OEM specifications to prevent contact with moving parts or excessive heat sources.

Quality Assurance and Warranty

Dayco manufactures the Small I.D. Heater Hose 88504 to meet stringent SAE standards, providing reliable performance in automotive heating systems. While specific warranty details are not provided, Dayco products typically adhere to industry quality controls to ensure durability and fitment accuracy for BMW 3 Series vehicles.