Dayco 71663 upper radiator coolant hose for the 2001-2006 BMW M3 and other vehicles carries coolant between the engine and the radiator.
A cracked or swollen hose, or coolant seeping at its ends, can mean it is worn. A leaking thermostat housing, a weak radiator cap or a failing water pump can be behind coolant loss and overheating too, so find the cause before buying. Each car takes one hose in the upper position.
This hose is a direct-fit replacement for the 2001-2006 BMW M3, the 2001-2003 BMW 525i and the 2001-2003 BMW 530i. Driving a different BMW? Look up its year and model in the "Vehicles it fits" section.
Fit and size
Build and materials
Interchange: 20372S · 22361M · 22625M · 22725M · 22439 · 22638 · 23888 · 62463 · 23418 · 16154 · 16558 · 9072 · 9271
This part cross-references / interchanges with the following part numbers:
Is this Dayco radiator coolant hose right for the 2001-2006 BMW M3?
Yes. Dayco 71663 is listed for the 2001-2006 BMW M3 in the upper position, and each car takes one.
Does the Dayco coolant hose fit the 2001-2003 BMW 525i?
Yes. Dayco 71663 is listed for the 2001-2003 BMW 525i and the 2001-2003 BMW 530i, also in the upper position.
What size is the Dayco 71663 upper hose?
Dayco 71663 is a single I.D. hose with a 12 in trunk height and a diameter of 1 19/32 in (1.59 in).
What material and SAE specifications does this upper hose meet?
The hose is EPDM and meets SAE J20R4 Class D-1 and SAE J1684 Type EC.
What signs can show an upper radiator coolant hose is failing?
With the engine off and cool, look for cracks, swelling or coolant seepage near the hose ends. Any of these can mean the hose is worn.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
