OE Quality
60-Day Returns

Gates CO35012 Engine Coolant Thermostat Housing
Overview of Gates Coolant Outlet Thermostat Housing CO35012
The Gates Coolant Outlet Engine Coolant Thermostat Housing CO35012 is designed for reliable cooling system performance in select Hyundai and Kia vehicles. This thermostat housing is engineered to meet exact OE specifications, ensuring proper fit and function for models like the Hyundai Sonata, Santa Fe, and Kia Optima.
- Constructed from durable plastic material for corrosion resistance
- Multiple outlet outside diameters ranging from 0.34 to 1.37 inches
- Two bolt holes for secure mounting
- Exact OE replacement part for precise fitment
- Compatible with Hyundai and Kia models including Optima, Santa Fe, Santa Fe Sport, Sonata, and Sorento
Detailed Product Features and Specifications
The Gates Coolant Outlet thermostat housing CO35012 is made from high-quality plastic, providing a lightweight yet durable solution for your vehicle's cooling system. It features multiple outlet outside diameters (.34, .47, .7, .86, and 1.37 inches) and corresponding inside diameters (.2, .31, .56, .7, and 1.13 inches), accommodating various hose connections. The housing includes two bolt holes for secure installation and does not come with a gasket. This part is an exact OE replacement, ensuring compatibility and reliable performance in Hyundai and Kia vehicles.
About the Gates Coolant Outlet Product Line
The Gates Coolant Outlet line focuses on providing precise and durable thermostat housings and related cooling components. This product line is engineered to meet or exceed original equipment standards, offering dependable cooling system parts that maintain engine temperature regulation. The CO35012 thermostat housing is part of this line, designed specifically for select Hyundai and Kia models to ensure proper coolant flow and system integrity.
Common Applications and Problem Resolution
- Replacement of cracked or leaking thermostat housing
- Resolving coolant leaks causing engine overheating
- Restoring proper coolant flow in Hyundai Sonata and Kia Sorento cooling systems
- Fixing damaged or worn outlet connections on thermostat housings
- Maintaining engine temperature regulation in Hyundai Santa Fe and Kia Optima
Installation Notes and Tips
When installing the Gates CO35012 thermostat housing, ensure the mating surfaces are clean and free of old gasket material since this part does not include a gasket. Use the two bolt holes to securely fasten the housing, and verify outlet hose connections match the specified diameters for a proper seal. It is recommended to inspect the cooling system for leaks after installation and refill coolant as necessary.
Quality Assurance and Warranty
This Gates thermostat housing is manufactured to meet exact OE specifications, providing reliable fit and function. While specific warranty details are not provided, Gates products typically adhere to stringent quality control standards to ensure durability and performance in automotive cooling systems.
| Brand | Gates |
| Part Number | CO35012 |
| Position | Coolant Outlet |
| Material | Plastic |
| Outlet Outside Diameter | .34 |
| Outlet Outside Diameter | .47 |
| Outlet Outside Diameter | .7 |
| Outlet Outside Diameter | .86 |
| Outlet Outside Diameter | 1.37 |
| Bolt Hole Quantity | 2 |
| Type | Thermostat housing |
| Gasket Quantity | 0 |
| Outlet Inside Diameter | .2 |
| Outlet Inside Diameter | .31 |
| Outlet Inside Diameter | .56 |
| Outlet Inside Diameter | .7 |
| Outlet Inside Diameter | 1.13 |
| 9841 | 0 |
| 9848 | No |
| Contents | Thermostat housing |
| OE Exact | Yes |
This part fits 13 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2019 | Hyundai | Santa Fe | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; Coolant Outlet |
| 2019 | Hyundai | Sonata | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; Coolant Outlet |
| 2019 | Kia | Optima | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; Coolant Outlet |
| 2018 | Hyundai | Sonata | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; Coolant Outlet |
| 2018 | Kia | Optima | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; Coolant Outlet |
| 2018 | Kia | Sorento | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; Coolant Outlet |
| 2017 | Hyundai | Santa Fe Sport | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; Coolant Outlet |
| 2017 | Kia | Optima | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; Coolant Outlet |
| 2017 | Kia | Sorento | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; Coolant Outlet |
| 2016 | Hyundai | Sonata | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; Coolant Outlet |
| 2016 | Kia | Optima | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; Coolant Outlet |
| 2016 | Kia | Sorento | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; Coolant Outlet |
| 2015 | Hyundai | Sonata | 2.0L | L4 | GAS | N/A | Engine Coolant Water Outlet - Thermostat Housing; 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.