HomeHVAC > Hoses and PipesFour Seasons 85902 HVAC Heater Hose Connector
Part #: 85902

Four Seasons 85902 HVAC Heater Hose Connector

Coolant Coupling
⚙️ 6 vehicles fit this part
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Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
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✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
📦Coolant Coupling
🚗Fitment: Mazda, 6
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Four Seasons Coolant Coupling 85902

The Four Seasons Coolant Coupling 85902 is designed specifically for Mazda 6 models, providing a reliable connection within the engine coolant system. Manufactured from durable plastic, this HVAC heater hose connector ensures proper coolant flow without including a thermostat or gasket.

  • Constructed from high-quality plastic material
  • Compatible with Mazda 6 vehicles
  • Inlet diameter of 0.754 inches for precise fit
  • Maximum height of 3.000 inches
  • Meets or exceeds OEM specifications
  • Does not include thermostat or gasket
  • Part number 85902 for accurate identification

Detailed Product Description

The Four Seasons Coolant Coupling 85902 is an essential HVAC heater hose connector designed to maintain the integrity of the engine coolant system in Mazda 6 vehicles. This plastic coupling features an inlet diameter of 0.754 inches and a maximum height of 3.000 inches, ensuring a secure and precise fit. It is engineered without a thermostat and does not include a gasket or seal, making it suitable for applications where these components are not required. The part meets or exceeds OEM standards, providing dependable performance and compatibility with factory specifications.

About the Four Seasons Coolant Coupling Product Line

The Coolant Coupling line by Four Seasons focuses on engine coolant components that facilitate efficient coolant flow and system connectivity. This product line is designed to offer reliable replacements for HVAC heater hose connectors, ensuring proper fitment and durability. The 85902 coupling is part of this line, tailored to meet the specific requirements of Mazda 6 cooling systems without including additional components like thermostats or gaskets.

Common Applications and Issues Addressed

  • Replacement of worn or damaged heater hose connectors in Mazda 6 coolant systems
  • Resolving coolant leaks caused by cracked or broken couplings
  • Maintaining proper coolant flow to prevent engine overheating
  • Ensuring secure connections in HVAC heater hose assemblies
  • Supporting system integrity after thermostat or gasket removal

Installation Notes and Tips

When installing the Four Seasons Coolant Coupling 85902, ensure the inlet diameter matches the hose size for a secure fit. Since this part does not include a gasket or thermostat, verify that these components are either not required or installed separately. Properly inspect the surrounding hoses and clamps for wear and replace as necessary to prevent leaks. Follow vehicle-specific service manual instructions for coolant system maintenance and coupling installation.

Quality Assurance and Warranty

This Four Seasons coolant coupling meets or exceeds OEM specifications, ensuring compatibility and reliable performance in Mazda 6 vehicles. While no specific warranty information is provided, Four Seasons products are generally manufactured to industry standards for durability and fitment. Always verify part number 85902 for correct application before installation.

BrandFour Seasons
Part Number85902
PositionCoolant Coupling
DescriptionEngine Coolant Components
Gasket Or Seal IncludedNot Included
Inlet Dia. IN0.754
MaterialPlastic
Maximum Height3.000
Meets / Exceeds OEM?Yes
Stylew/o Thermostat
Thermostat Included?Not Included
TypeCoolant Coupling

This part fits 6 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2008Mazda63.0LV6N/ACoolant Coupling
2007Mazda63.0LV6N/ACoolant Coupling
2006Mazda63.0LV6N/ACoolant Coupling
2005Mazda63.0LV6N/ACoolant Coupling
2004Mazda63.0LV6N/ACoolant Coupling
2003Mazda63.0LV6N/ACoolant Coupling

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

605204381572385902902003CH1001GK3K6124XAGK3K6124XBGK3K6124XCGK3K6124XDGK3K6124XEGK3K6124XFGK3K6124XGGK3K6124XHW98432

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.