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Gates 33937 Engine Coolant Thermostat
| Brand | Gates 33937 |
|---|---|
| 1 | |
| Bolt Hole Quantity | 4 |
| Check Valve | No |
| Electric | No |
| Electric | No |
| Jiggle Pin Weep Hole | Yes |
| Jiggle Pin/Check Valve | Yes |
| Number of Bolt Holes | 4 |
| Number of Jiggle Pins/Check Valves | 1 |
| Number of Seals | 1 |
| OE Comparison Rating | OE Exact |
| OE Exact | Yes |
| Outlet Inside Diameter | 1.189 |
| Outlet Inside Diameter 1 (in) | 1.189 |
| Outlet Inside Diameter 2 (in) | 1.189 |
| Outlet Outside Diameter | 1.41 |
| Outlet Outside Diameter 1 (in) | 1.41 |
| Outlet Outside Diameter 2 (in) | 1.41 |
| Start to Open Temperature | 95 |
| Start to Open Temperature | 203 |
| Temperature (C) | 95 |
| Type | Integrated Housing Thermostat |
| Product line | Integrated Housing Thermostat |
| Fits | BMW · 15 vehicles |
OE exact replacement. Integrated housing thermostat for a precise, direct-fit solution.
Accurate temperature control. Helps regulate coolant flow so the engine runs more efficiently.
Built with a jiggle pin. Includes a weep hole and one seal for dependable operation.
Cross-references AMS Automotive 4632, Dorman - HELP 46913 and Febi-Bilstein 33937 for the same application. See all 8.
Gates Integrated Housing Thermostat for BMW Cooling Control
The Gates 33937 integrated housing thermostat is an OE-exact engine coolant thermostat assembly for select BMW applications. It regulates coolant flow at the specified opening temperature to help maintain stable engine operating temperature in 1996-1999 BMW 318i, 318is, 318ti, and 1996-1998 BMW Z3 models.
Key Features
- Integrated housing thermostat design for direct replacement service
- Start to open temperature: 203°F / 95°C
- OE Exact comparison rating for application-specific fit and function
- 4 bolt holes for mounting
- Jiggle pin weep hole and jiggle pin/check valve: yes
- 1 seal included in the design specification
- Outlet inside diameter: 1.189 in; outlet outside diameter: 1.41 in
- Non-electric thermostat construction
Product Details
Gates Integrated Housing Thermostat line focuses on accurate temperature regulation in modern cooling systems that use integrated thermostat housings. Part number 33937 is built as an OE-exact replacement for BMW cooling system service, helping restore proper coolant control in vehicles that rely on this housing-style thermostat. This part cross-references Motorad 469-203 for the same application.
Common Cooling System Issues It May Address
- Engine running too cool or too warm due to thermostat control problems
- Temperature fluctuation from a worn thermostat housing assembly
- Coolant flow irregularities affecting operating temperature stability
- Service replacement needs on BMW 318i, 318is, 318ti, and Z3 cooling systems
- Fitment-related replacement for OE-style integrated thermostat housing service
Installation Notes and Fitment
Compatible With 1996-1999 BMW 318i, 1996-1999 BMW 318is, 1996-1999 BMW 318ti, and 1996-1998 BMW Z3. Verify the housing style, outlet dimensions, and temperature specification before installation. Clean the mating surfaces thoroughly and inspect the cooling system for contamination, hose wear, or related leaks before returning the vehicle to service. The Gates 33937 is commonly searched as a BMW 318i thermostat housing replacement and a BMW Z3 engine coolant thermostat solution.
Quality Assurance
Gates positions this integrated thermostat housing as an aftermarket alternative to OE dealership parts, with research and development focused on cooling system accuracy and application coverage for integrated housing designs. Part number 33937 is specified as OE Exact for the listed BMW applications.
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 1999 | BMW | 318i | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1999 | BMW | 318is | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1999 | BMW | 318ti | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1998 | BMW | 318i | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1998 | BMW | 318is | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1998 | BMW | 318ti | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1998 | BMW | Z3 | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1997 | BMW | 318i | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1997 | BMW | 318is | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1997 | BMW | 318ti | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1997 | BMW | Z3 | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1996 | BMW | 318i | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1996 | BMW | 318is | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1996 | BMW | 318ti | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
| 1996 | BMW | Z3 | 1.9L | L4 | GAS | N/A | 203 Degree; OE Temperature; Seal included; Integrated Housing Thermostat |
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