OE Quality
60-Day Returns

Gates CO35038 Engine Coolant Thermostat Housing Cover
Reliable Engine Coolant Thermostat Housing Cover for Hyundai and Kia
The Gates Coolant Outlet CO35038 is a precision-engineered engine coolant thermostat housing cover designed specifically for Hyundai Optima and Kia Sonata models. Crafted from durable plastic, this thermostat cover ensures proper coolant flow and system integrity for efficient engine temperature regulation.
Key Features of Gates Coolant Outlet CO35038
- Constructed from high-quality plastic for corrosion resistance and durability
- Exact OE replacement part ensuring perfect fit and function
- Three bolt holes for secure mounting
- Outlet outside diameter of 1.37 inches and inside diameter of 1.12 inches for precise coolant flow
- Thermostat cover type designed to maintain optimal engine temperature
- Compatible with Hyundai Optima and Kia Sonata models
Detailed Product Description
The Gates Coolant Outlet product line focuses on delivering reliable cooling system components that meet or exceed original equipment specifications. The CO35038 thermostat housing cover is manufactured from durable plastic, providing resistance to heat and corrosion commonly found in engine compartments. With three bolt holes, this cover mounts securely to the engine, maintaining a tight seal without the need for additional gaskets. The outlet dimensions—1.37 inches outside diameter and 1.12 inches inside diameter—are engineered to match the original equipment, ensuring consistent coolant flow and preventing leaks. This part is an exact OE replacement, making it a dependable choice for maintaining the cooling system integrity in Hyundai Optima and Kia Sonata vehicles.
Common Applications and Issues Addressed
- Replacement of cracked or damaged thermostat housing covers
- Resolving coolant leaks around the thermostat outlet
- Preventing engine overheating due to faulty thermostat cover seals
- Maintaining proper coolant flow for engine temperature regulation
- Restoring cooling system reliability in Hyundai Optima and Kia Sonata models
Installation Notes and Tips
Ensure the engine is cool before beginning installation to avoid burns. Clean the mounting surface thoroughly to remove old gasket material or debris. Since this thermostat cover does not include a gasket, verify if a gasket or sealant is required based on your vehicle’s service manual. Tighten the three mounting bolts evenly to the manufacturer’s torque specifications to prevent leaks and ensure a secure fit.
Quality Assurance and Warranty
The Gates Coolant Outlet CO35038 is manufactured to meet exact OE specifications, providing reliable performance and fitment. Gates products are known for their quality and durability in automotive cooling systems. Please refer to Gates’ official warranty policy for specific coverage details.
| Brand | Gates |
| Part Number | CO35038 |
| Position | Coolant Outlet |
| Material | Plastic |
| Outlet Outside Diameter | 1.37 |
| Bolt Hole Quantity | 3 |
| Type | Thermostat cover |
| Gasket Quantity | 0 |
| Outlet Inside Diameter | 1.12 |
| 9841 | 0 |
| 9848 | No |
| Contents | Thermostat cover |
| OE Exact | Yes |
This part fits 11 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2016 | Kia | Optima | 2.4L | L4 | ELECTRIC/GAS | N/A | Engine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet |
| 2015 | Hyundai | Sonata | 2.4L | L4 | ELECTRIC/GAS | N/A | Engine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet |
| 2015 | Kia | Optima | 2.4L | L4 | ELECTRIC/GAS | N/A | Engine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet |
| 2014 | Hyundai | Sonata | 2.4L | L4 | ELECTRIC/GAS | N/A | Engine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet |
| 2014 | Kia | Optima | 2.4L | L4 | ELECTRIC/GAS | N/A | Engine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet |
| 2013 | Hyundai | Sonata | 2.4L | L4 | ELECTRIC/GAS | N/A | Engine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet |
| 2013 | Kia | Optima | 2.4L | L4 | ELECTRIC/GAS | N/A | Engine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet |
| 2012 | Hyundai | Sonata | 2.4L | L4 | ELECTRIC/GAS | N/A | Engine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet |
| 2012 | Kia | Optima | 2.4L | L4 | ELECTRIC/GAS | N/A | Engine Coolant Thermostat Housing Cover - Fits multiple vehicle models.; Coolant Outlet |
| 2011 | Hyundai | Sonata | 2.4L | L4 | ELECTRIC/GAS | N/A | Thermostat Cover; Feb. 9, 2011 & Newer; Coolant Outlet |
| 2011 | Kia | Optima | 2.4L | L4 | ELECTRIC/GAS | N/A | Engine 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:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.