HomeBelts and Cooling > Thermostat and HousingGates CO34903 Engine Coolant Thermostat Housing Cover
Part #: CO34903

Gates CO34903 Engine Coolant Thermostat Housing Cover

Coolant Outlet
⚙️ 15 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: Honda and Acura, Accord, CL, and Odyssey
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Gates CO34903 Engine Coolant Thermostat Housing Cover

The Gates CO34903 Engine Coolant Thermostat Housing Cover is designed for reliable cooling system performance in Acura and Honda vehicles. This thermostat cover is engineered to meet exact OE specifications, ensuring a precise fit for models like the Honda Accord, CL, and Odyssey.

  • Constructed from durable cast aluminum for strength and corrosion resistance
  • Features three bolt holes for secure mounting
  • Outlet outside diameter measures 1.26 inches, inside diameter 1.05 inches
  • Thermostat cover type with no by-pass holes
  • OE exact replacement part for accurate fit and function

Detailed Product Description

The Gates Coolant Outlet product line includes this CO34903 thermostat housing cover, crafted from cast aluminum to provide long-lasting durability and resistance to heat and corrosion. This part is specifically designed as a coolant outlet with an outside diameter of 1.26 inches and an inside diameter of 1.05 inches, ensuring proper coolant flow. The cover includes three bolt holes for secure installation and does not require additional gaskets or seals, simplifying replacement. It is an exact OE match, making it a reliable choice for maintaining the cooling system integrity in Acura and Honda vehicles such as the Accord, CL, and Odyssey.

Common Applications and Issues Addressed

  • Replacement of cracked or damaged thermostat housing covers
  • Resolving coolant leaks around the thermostat outlet
  • Preventing overheating caused by faulty coolant flow
  • Maintaining proper engine temperature regulation
  • Restoring OEM cooling system performance in Acura and Honda models

Installation Notes and Tips

When installing the Gates CO34903 thermostat housing cover, ensure the mating surfaces are clean and free of old gasket material, even though this part does not include a gasket. Use the three bolt holes to securely fasten the cover, tightening bolts to manufacturer torque specifications. Verify the outlet diameters match the vehicle’s coolant hose connections for a proper seal. This part is designed for direct replacement on compatible Acura and Honda models, simplifying installation.

Quality Assurance and Warranty

Gates manufactures the CO34903 thermostat housing cover to meet or exceed original equipment standards. The cast aluminum construction provides durability and resistance to corrosion and heat. This part is an OE exact replacement, ensuring compatibility and reliable performance. Warranty details should be confirmed with the distributor or manufacturer, as they may vary.

BrandGates
Part NumberCO34903
PositionCoolant Outlet
0
No
Bolt Hole Quantity3
By-Pass HolesNo
ContentsCoolant Outlet
Gasket Quantity0
MaterialCast Aluminum
Number of Bolt Holes3
Number of Gaskets0
Number of Seals0
OE ExactYes
Outlet Inside Diameter1.05
Outlet Inside Diameter 1 (in)1.05
Outlet Outside Diameter1.26
Outlet Outside Diameter 1 (in)1.26
TypeCoolant Outlet
TypeThermostat Cover

This part fits 15 vehicles. Search below:

YearMakeModelLitersCylindersFuel TypePositionNotes
2002HondaAccord2.3LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
2001HondaAccord2.3LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
2000HondaAccord2.3LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
1999AcuraCL2.3LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
1999HondaAccord2.3LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
1998AcuraCL2.3LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
1998HondaAccord2.3LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
1998HondaOdyssey2.3LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
1997AcuraCL2.2LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
1997HondaAccord2.2LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
1997HondaOdyssey2.2LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
1996HondaAccord2.2LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
1996HondaOdyssey2.2LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
1995HondaAccord2.2LL4GASN/AEngine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet
1995HondaOdyssey2.2LL4GASN/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:

19311P0A01085157902-5017CH5157

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