Autotecnica SU0715421 Engine Coolant Bypass Hose

Engine Coolant Bypass Hose for Subaru Applications

The Autotecnica SU0715421 engine coolant bypass hose is a direct-fit replacement for select Subaru and Saab 9-2X cooling system layouts. Built from EPDM rubber and shaped to OE bypass hose dimensions, it supports a clean installation on vehicles such as the Subaru Forester, Impreza, Legacy, Outback, and Baja.

Use this hose when servicing the coolant bypass circuit on applications that route coolant between the water pump, pipe, and thermostat. The black EPDM construction is made for heat, ozone, and electrochemical degradation resistance, with a temperature range from -40°F to 275°F.

Key Features

• Autotecnica SU0715421 engine coolant bypass hose
• Precision-molded to OE bypass hose dimensions and shape
• EPDM hose material with ECD resistance to help reduce internal rubber breakdown
• Heat- and ozone-resistant construction for cooling system service
• Black finish for a factory-style appearance
• Temperature rating: -40°F to 275°F (-40°C to 135°C)
• Clamps not included

Detailed Description

The SU0715421 is an OE-style coolant bypass hose designed for Subaru cooling system routing where the hose connects the water pump, pipe, or thermostat depending on application. It measures approximately 5.3 inches centerline length, with end inside diameters of 1.33 inches and 1.29 inches, and is formed from durable EPDM rubber for consistent sealing and long-term service. This part cross-references Dayco 87964 and Gates 19535 for the same application.

For buyers searching for a Subaru Forester coolant bypass hose, Subaru Impreza thermostat hose, or Subaru Legacy water pump to pipe hose, this part number SU0715421 provides a direct replacement option for the listed cooling system positions.

What It Helps Address

• Coolant leaks at a worn or cracked bypass hose
• Heat-related hose hardening or splitting
• Ozone and age-related rubber deterioration
• Cooling system service on Subaru water pump to pipe and thermostat routing
• Replacement of a damaged hose during thermostat or water pump maintenance

Installation Notes and Tips

Verify the hose position on your vehicle before installation, since this part is used in multiple Subaru cooling system locations including Pipe-2 to Thermostat, Pipe-3 to Thermostat, Water Pump to Pipe, Thermostat to Pipe-1, and Pipe to Thermostat. Compare the hose shape and end diameters to the removed part before assembly. Clamps are not included, so reuse or replace the clamps as needed during service.

• Fits 2007-2013 Subaru Forester, Pipe-2 To Thermostat
• Fits 2004-2005 Subaru Forester, Pipe-2 To Thermostat
• Fits 2006-2009 Subaru Impreza, Pipe-3 To Thermostat
• Fits 2004-2009 Subaru Legacy, Water Pump To Pipe
• Fits 2006-2009 Subaru Legacy, Pipe-3 To Thermostat
• Fits 2003-2009 Subaru Outback, Water Pump To Pipe
• Fits 2005-2009 Subaru Outback, Thermostat To Pipe-1
• Fits 2003-2008 Subaru Forester, Water Pump To Pipe
• Fits 2002-2008 Subaru Impreza, Water Pump To Pipe
• Fits 1998 Subaru Impreza, Water Pump To Pipe
• Fits 2003-2006 Subaru Baja, Water Pump To Pipe
• Fits 2006 Subaru Forester, Pipe-3 To Thermostat
• Fits 2005 Saab 9-2X, Pipe-2 To Thermostat
• Fits 2004-2005 Subaru Impreza, Pipe-2 To Thermostat
• Fits 2002 Subaru Impreza, Pipe-2 To Thermostat
• Fits 2005 Subaru Legacy, Thermostat To Pipe-1
• Fits 2000-2003 Subaru Legacy, Pipe To Thermostat
• Fits 1998-2002 Subaru Forester, Pipe To Thermostat
• Fits 1993-2001 Subaru Impreza, Pipe To Thermostat

Quality Assurance

Autotecnica lists this hose with a 24-month unlimited mileage warranty. The EPDM construction is specified for resistance to engine heat, ozone, and electrochemical degradation, supporting dependable service in Subaru cooling system applications.