HomeBelts and Cooling > Thermostat and HousingGates CO34901 Engine Coolant Thermostat Housing Cover
Part #: CO34901

Gates CO34901 Engine Coolant Thermostat Housing Cover

Coolant Outlet
⚙️ 7 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 Outlet
🚗Fitment: Lexus and Toyota, RX330 and Sienna
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Gates Coolant Outlet CO34901

The Gates Coolant Outlet CO34901 is a precision-engineered engine coolant thermostat housing cover designed for select Lexus and Toyota vehicles. Crafted from durable plastic, this coolant outlet ensures reliable performance and proper coolant flow for your Lexus RX330 or Toyota Sienna.

  • Material: High-quality plastic construction
  • Outlet Outside Diameter: 1.43 inches
  • Outlet Inside Diameter: 1.18 inches
  • Bolt Hole Quantity: 4 for secure mounting
  • Type: Thermostat cover, coolant outlet
  • By-Pass Holes: None
  • Gasket Quantity: 0 (gasket not included)

About the Gates Coolant Outlet Product Line

The Gates Coolant Outlet line focuses on providing reliable and precise replacement parts for engine cooling systems. This product line includes thermostat covers and coolant outlets designed to maintain optimal engine temperature by ensuring proper coolant circulation. The CO34901 part is engineered to meet the specific dimensional requirements for compatible Lexus and Toyota models, supporting efficient cooling system operation.

Detailed Product Description

The Gates CO34901 engine coolant thermostat housing cover is molded from durable plastic to resist corrosion and withstand engine heat. It features an outlet outside diameter of 1.43 inches and an inside diameter of 1.18 inches, dimensions critical for maintaining proper coolant flow. The part includes four bolt holes to ensure a secure and stable fit on the engine. This thermostat cover does not include gaskets or seals, so replacement gaskets should be sourced separately if needed. It is designed without by-pass holes, focusing on a straightforward coolant outlet function.

Compatible Vehicles and Common Applications

  • Compatible with Lexus RX330 models requiring a thermostat housing cover
  • Compatible with Toyota Sienna models needing a coolant outlet replacement
  • Addresses coolant leaks from damaged or cracked thermostat covers
  • Resolves overheating issues caused by faulty coolant outlet components
  • Replaces worn or broken plastic thermostat housing covers

Installation Notes and Tips

When installing the Gates CO34901 coolant outlet, ensure the mating surfaces are clean and free of old gasket material. Since this part does not include gaskets or seals, use appropriate replacement gaskets to prevent leaks. Tighten the four mounting bolts evenly to the manufacturer’s torque specifications to avoid warping or damage. Inspect the cooling system hoses for wear during installation to maintain overall system integrity.

Quality Assurance and Warranty

Gates manufactures the CO34901 coolant outlet to meet stringent quality standards for durability and fitment. While this part is not an exact OE replacement, it is engineered to closely match original specifications for reliable performance. Please consult product documentation or contact Gates for warranty details specific to this part number.

BrandGates
Part NumberCO34901
PositionCoolant Outlet
MaterialPlastic
Outlet Outside Diameter1.43
Bolt Hole Quantity4
TypeThermostat cover
Gasket Quantity0
Outlet Inside Diameter1.18
98410
9848No
By-Pass HolesNo
ContentsCoolant outlet
Number of Bolt Holes4
Number of Gaskets0
Number of Seals0
OE ExactNo
Outlet Inside Diameter 1 (in)1.18
Outlet Outside Diameter 1 (in)1.43
TypeCoolant outlet

This part fits 7 vehicles. Search below:

YearMakeModelLitersCylindersFuel TypePositionNotes
2006LexusRX3303.3LV6GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
2006ToyotaSienna3.3LV6GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
2005LexusRX3303.3LV6GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
2005ToyotaSienna3.3LV6GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
2004LexusRX3303.3LV6GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
2004ToyotaSienna3.3LV6GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
2003ToyotaSienna3.0LV6GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet

* 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:

163210A04085354902-5123CH2123

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