Gates CO34837 Engine Coolant Hose Connector - Coolant Filler Neck

Gates Coolant Outlet for OE-Style Fit

The Gates Coolant Outlet CO34837 is an engine coolant hose connector built for direct replacement service at the coolant filler neck. It is made from plastic and follows OE exact dimensions for a fit that matches the original layout on select Toyota Sienna and Lexus RX350 applications. Gates CO34837 is part of the Coolant Outlet line, which focuses on replacing worn or damaged coolant outlet components with a cost-effective OE-style solution.

Compatible With 2007-2010 Toyota Sienna, coolant filler neck, and 2007-2009 Lexus RX350, coolant filler neck. This part cross-references Dorman OE Solutions 902-408 for the same application.

Key Features

• Engine coolant hose connector / coolant outlet
• OE exact fitment for direct replacement service
• Plastic construction for factory-style configuration
• Outlet dimensions: 1.43 in, 1.355 in, .397 in, and .337 in outside diameter
• Outlet inside diameters: 1.21 in, 1.088 in, .313 in, and .232 in
• No bolt holes, no gasket, and no seal provisions listed
• Designed for coolant filler neck applications on Toyota Sienna and Lexus RX350

Product Details

Gates CO34837 is engineered as a replacement coolant outlet for vehicles that use a hose connector at the coolant filler neck. The part is shaped to match original equipment dimensions and mounting style, helping restore the coolant connection point without changing the factory layout. For drivers searching for a Toyota Sienna coolant outlet or Lexus RX350 coolant filler neck hose connector, this Gates part provides a direct-fit replacement option with OE-style sizing.

Common Problems This Part Can Address

• Cracked or brittle coolant outlet housing
• Coolant seepage at the filler neck connection
• Damaged hose connector surfaces
• Improper sealing from a worn original outlet
• Replacement needs after coolant system service on Toyota Sienna or Lexus RX350

Installation Notes and Tips

Verify the outlet diameter and hose connection points against the original part before installation. Inspect the mating hose, clamps, and surrounding coolant filler neck area for wear, heat damage, or residue before reassembly. Drain the cooling system as needed and refill with the correct coolant specification after installation. Confirm there are no leaks once the engine reaches operating temperature.

Quality Assurance

Gates Coolant Outlets are built to address common design, material, and manufacturing issues seen in many aftermarket alternatives while maintaining OE-style fit and function. Gates CO34837 is intended to deliver long service life in the original application layout.