Dayco 88505 HVAC Heater Hose - Reservoir To Auxiliary Water Pump
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Dayco
 Small I.D. Heater Hose

Dayco 88505 HVAC Heater Hose - Reservoir To Auxiliary Water Pump

Brand Dayco 88505
Position Reservoir To Auxiliary Water Pump
Material Epdm
Color Black
End 1 Inside Diameter 31/32
End 2 Inside Diameter 31/32
Contains Heat Shield N
Contains Protective Sleeve N
End 1 Outside Diameter 1 11/32
End 2 Outside Diameter 1 11/32
Hose Type Single i.d. hose
SAE Specification Sae j20r3 class d-1, sae j1684 type ec
Trunk Height 21 1/2
Product line Small I.D. Heater Hose
Fits BMW · 9 vehicles

EPDM construction. Built for coolant hose service with a durable rubber compound.

SAE-rated design. Meets SAE J20R3 Class D-1 and SAE J1684 Type EC specifications.

Small I.D. hose. Sized for compact coolant routing with matching end diameters.

$44.18Free shipping
In stock · usually ships same day before 1pm CST
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Free returns within 60 days if it doesn't fit when fitment is verified.
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Small I.D. Heater Hose Overview

Dayco 88505 is a small I.D. heater hose built for coolant transfer in BMW cooling system applications. It uses EPDM construction and a single I.D. hose design to match the specified connection sizes and routing requirements.

Key Features

  • EPDM rubber construction for coolant hose service
  • Single I.D. hose design with 31/32 in. inside diameter at both ends
  • Black finish for a clean OE-style appearance
  • Built to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
  • Fits BMW 528i, 525i, and 530i cooling system applications listed below

Detailed Description

This Dayco HVAC heater hose is intended for coolant routing between the reservoir and auxiliary water pump in the listed BMW applications. The hose is identified as part number 88505 and is engineered as a small I.D. hose with matching end dimensions for the specified connection points. If you are replacing a worn or leaking BMW 528i, 525i, or 530i hose, this part number 88505 provides a direct match to the cataloged application notes.

Dayco’s Small I.D. Heater Hose line focuses on coolant hose service where compact routing and consistent fit are required. The EPDM material and SAE-rated construction make it a practical replacement for BMW cooling system service, including the reservoir-to-auxiliary-water-pump routing noted in the fitment data.

What It Is Used For

  • Replacing a cracked or softened coolant hose
  • Restoring coolant flow between the reservoir and auxiliary water pump
  • Addressing coolant seepage at hose connections
  • Correcting hose fit issues on the specified BMW cooling circuit

Installation Notes and Tips

Verify the hose routing, end diameters, and connection style before installation. This part is listed for BMW 528i, 525i, and 530i applications with reservoir-to-auxiliary-water-pump routing and quick connectors noted in the fitment data. Confirm the existing hose path and compare the part number 88505 to the removed component before installation.

Quality Assurance

Dayco manufactures this hose to SAE J20R3 Class D-1 and SAE J1684 Type EC standards for coolant hose applications.

Related reading

This part fits 9 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2003BMW525iReservoir To Auxiliary Water PumpRadiator Coolant Hose with Quick Connectors.; Small I.D. Heater Hose
2003BMW530iReservoir To Auxiliary Water PumpRadiator Coolant Hose with Quick Connectors.; Small I.D. Heater Hose
2002BMW525iReservoir To Auxiliary Water PumpRadiator Coolant Hose with Quick Connectors.; Small I.D. Heater Hose
2002BMW530iReservoir To Auxiliary Water PumpRadiator Coolant Hose with Quick Connectors.; Small I.D. Heater Hose
2001BMW525iReservoir To Auxiliary Water PumpRadiator Coolant Hose with Quick Connectors.; Small I.D. Heater Hose
2001BMW530iReservoir To Auxiliary Water PumpRadiator Coolant Hose with Quick Connectors.; Small I.D. Heater Hose
2000BMW528iReservoir To Auxiliary Water PumpRadiator Coolant Hose with Quick Connectors.; Small I.D. Heater Hose
1999BMW528iReservoir To Auxiliary Water PumpRadiator Coolant Hose with Quick Connectors.; Small I.D. Heater Hose
1998BMW528iReservoir To Auxiliary Water PumpRadiator Coolant Hose with Quick Connectors.; Small I.D. Heater Hose