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Gates 33985 Engine Coolant Thermostat
OE Exact Thermostat for Toyota Tercel
The Gates OE Exact Thermostat 33985 is an engine coolant thermostat built to match OEM fit, function, and design. It is specified for the 1999 Toyota Tercel and uses a bottom by-pass design with a 180 degree start-to-open temperature for direct replacement service.
Key Features
- OE Exact Thermostat line from Gates for OEM-style replacement fitment
- Fits 1999 Toyota Tercel, N/A
- Start to open temperature: 180°F / 82°C
- Bottom by-pass design
- Steel and copper construction
- Jiggle pin weep hole included
- Sealing flange outside diameter: 1.89 in.
- Height: 2.17 in.; height between flanges: 1.38 in.
- Part number: 33985
Product Details
Gates OE Exact Thermostat 33985 is built for drivers who need an OEM-style coolant control component rather than a universal substitute. The steel and copper construction, bottom by-pass layout, and jiggle pin weep hole support proper coolant flow and air bleeding in the cooling system. This thermostat is listed for the 1999 Toyota Tercel and matches the OE temperature specification for that application. Gates 33985 is also referenced by Febi-Bilstein 33985, Gates 38148, and Stant 48148 for the same application.
What It Helps Address
- Engine running too cool or too hot from a worn thermostat
- Delayed coolant circulation after cold starts
- Temperature fluctuation caused by inconsistent thermostat opening
- Cooling system air pockets related to trapped air at the thermostat
- Incorrect thermostat fitment in OE-style replacement service
Installation Notes and Tips
Install the thermostat in the correct orientation for the bottom by-pass design and verify the sealing surfaces are clean before assembly. No installation tool is included, and no gasket quantity is listed for this part, so confirm the required sealing components for the vehicle before installation. After installation, refill and bleed the cooling system according to factory service procedures and verify normal operating temperature on the 1999 Toyota Tercel.
Quality Assurance
Gates markets the OE Exact Thermostat line as a direct-fit replacement series engineered to match OEM product fit, function, and design. Part number 33985 is built to OE temperature and dimensional specifications for the listed application.
| Brand | Gates |
|---|---|
| Part Number | 33985 |
| Position | OE Exact Thermostat |
| Material | Steel, copper |
| Sealing Flange Outside Diameter | 1.89 |
| Height Between Flanges | 1.38 |
| Design | Bottom by-pass |
| Type | Oe exact thermostat |
| Height | 2.17 |
| Gasket Quantity | 0 |
| Jiggle Pin Weep Hole | Yes |
| Start to Open Temperature | 180 |
| Start to Open Temperature | 82 |
| Installation Tool Included | No |
| 9813 | 1.1 |
| 9841 | 0 |
| 9852 | 1 |
| 9907 | .79 |
| By-Pass Flange Diameter (in) | 1.1 |
| Design | Bottom by-pass |
| Height from Flange (in) | .79 |
| Includes Installation Tool | No |
| Material | Steel, copper |
| Number of Gaskets | 0 |
| Number of Jiggle Pins/Check Valves | 1 |
| Number of Seals | 0 |
This part fits 1 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 1999 | Toyota | Tercel | 1.5L | L4 | GAS | N/A | Available Until Stock Depleted; 180 Degree; OE Temperature; OE Exact Thermostat |
* 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.