Gates 33557 Engine Coolant Thermostat

OE Type Thermostat for Precise Cooling Control

The Gates 33557 OE Type Thermostat is built for direct-fit engine coolant temperature control in select Toyota, Honda, Acura, and Isuzu applications. It is engineered for OEM-equivalent fit and leak-free sealing, with a 170-degree start-to-open temperature for the listed vehicles.

Gates OE Type Thermostats are part of the OE Type Thermostat line, focused on replacement parts that match original-style fit and operating characteristics for everyday cooling system service.

Key Features

• OE Type thermostat for engine coolant temperature regulation
• 170-degree start-to-open temperature
• Reverse poppet design
• Stainless steel and copper construction
• Jiggle pin weep hole for air bleeding during service
• OE Performance comparison rating
• Direct replacement for select Toyota Matrix, Toyota RAV4, Toyota Sienna, Honda Passport, Isuzu Rodeo, Isuzu Trooper, and Acura SLX applications

Detailed Description

Gates part number 33557 is an OE Type Engine Coolant Thermostat designed to maintain proper operating temperature in the cooling system. The reverse poppet design and metal construction support consistent thermostat movement and sealing performance, while the jiggle pin weep hole helps release trapped air during installation and refill. This thermostat is a practical choice for drivers servicing a 2008-2010 Toyota Matrix, 2009 Toyota RAV4, or 2009 Toyota Sienna, as well as select Honda, Acura, and Isuzu models listed in the fitment data. This part cross-references Four Seasons 33557 for the same application.

What It Helps Address

• Engine running too cool or too warm
• Delayed coolant flow regulation after startup
• Temperature fluctuation from a worn thermostat
• Cooling system air pockets after service
• Improper sealing at the thermostat housing interface

Installation Notes and Tips

• Verify the thermostat orientation before installation; this unit uses a reverse poppet design.
• Inspect the thermostat housing, sealing surfaces, and coolant condition before reassembly.
• Bleed air from the cooling system after refill to reduce hot spots and temperature swings.
• Confirm the vehicle application by year, make, and model before ordering.
• For fitment reference: Fits 2008-2010 Toyota Matrix, N/A; Fits 2009 Toyota RAV4, N/A; Fits 2009 Toyota Sienna, N/A; Fits 1996-1998 Acura SLX, N/A; Fits 1994-1997 Honda Passport, N/A; Fits 1993-1997 Isuzu Rodeo, N/A; Fits 1992-1997 Isuzu Trooper, N/A.

Quality Assurance

Gates engineers this OE Type Thermostat to provide precise temperature control and OEM-equivalent fit for the listed applications. The Gates 33557 is built to meet the demands of routine cooling system maintenance in compatible Toyota, Honda, Acura, and Isuzu vehicles.