Route coolant to the heater outlet and keep the cabin-heat and cooling circuit sealed with the Gates Modular Coolant Hose 51378. This heater hose drops in as a direct-fit replacement at the heater outlet position on the 2005-2008 Audi A4 and 2005-2008 Audi A4 Quattro with the L4-2.0L engine. Gates leads the aftermarket in modular-assembly coolant hoses, built to fit specific applications and mirror OEM specifications by integrating the OE-exact components the original relies on — such as hose branches, quick-connectors, sensors, and restrictors.
- Durable construction: EPDM tube with synthetic-fiber knit reinforcement and a heat-, ozone- and chemical-coolant-resistant EPDM cover.
- Vacuum-ready: specifically-engineered materials resist collapse under vacuum.
- Longer service life: engineered to resist electrochemical degradation, the leading cause of hose failure.
- Rated: meets SAE 20R3 EC Class D1 under 25mm (1 in.) ID and SAE 20R4 EC Class D1 for 25mm (1 in.) ID and over; temperature range -40°F to +257°F (-40°C to +125°C).
Gates recommends fitting new clamps whenever a coolant hose is installed. Not for fuel or oil transfer applications. Country of origin: Turkey.
Interchange: 22969M · 88517 · F10361 · R25493 · CHH0168 · CHH0168P · 8E1819373C · 8E1819373R · Manufacturer part number 51378
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicles does the Gates 51378 fit?
It is a direct-fit replacement for the 2005-2008 Audi A4 and 2005-2008 Audi A4 Quattro with the L4-2.0L engine. Check the Buyer's Guide tab to confirm your vehicle.
Where does this hose install?
It is cataloged for the heater outlet position, routing engine coolant through the heater circuit.
What is it made of?
An EPDM tube with synthetic-fiber knit reinforcement and a heat-, ozone- and chemical-coolant-resistant EPDM cover, designed to resist collapse under vacuum.
Should I replace the clamps too?
Yes. Gates recommends installing new clamps each time a new coolant hose is fitted.
Can I use this hose for fuel or oil?
No. This is a coolant hose only and must not be used for fuel or oil transfer applications.
Write a Review