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Four Seasons 37838 Engine Cooling Fan Temperature Switch
| Brand | Four Seasons 37838 |
|---|---|
| Connector Shape | Rectangular |
| Terminal Quantity | 3 |
| Connector Gender | Male |
| Description | Switch-temp /radiator mount |
| Fan Open/Closed | Open |
| Fitting Gender | Male |
| Fitting Thread | M14 x 1.50 |
| Fitting Thread Size | M14 x 1.50 |
| Function | Temperature switch |
| Meets / Exceeds OEM? | Yes |
| Mnt Sys Loc | Radiator mount |
| Style | Temperature |
| Temperature On | 176 / 190 |
| Type | Temperature |
| Product line | Temperature Switch |
| Fits | BMW · 7 vehicles |
OE direct replacement. Meets or exceeds OEM requirements for dependable cooling control.
Temperature switch. Automatically opens and closes the fan at set temperatures.
Rectangular connector. Three-terminal male connection for a secure electrical fit.
Cross-references Four Seasons 37838, 61318376440 and A14188 for the same application. See all 5.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Four Seasons 37838 Temperature Switch Overview
The Four Seasons 37838 engine cooling fan temperature switch is a radiator-mount temperature switch built for OE-style fan control. It uses a rectangular male connector with 3 terminals and an M14 x 1.50 thread for direct replacement service on select BMW cooling systems.
Compatible with 1997-1999 BMW 318ti, 1996-1998 BMW Z3, and 1997 BMW 318i, this Four Seasons Temperature Switch line part is specified to meet or exceed OEM requirements. The 37838 temperature switch is used to trigger cooling fan operation at the listed temperature points for proper radiator-mounted fan control.
Key Features
- Part number: 37838
- Engine cooling fan temperature switch for radiator-mount applications
- Rectangular male connector with 3 terminals
- M14 x 1.50 fitting thread
- Open fan configuration
- Temperature on points: 176 / 190
- Meets or exceeds OEM requirements
- Fits select BMW 318ti, Z3, and 318i applications
Detailed Product Description
Four Seasons 37838 is a temperature switch designed for radiator mounting in BMW cooling systems that rely on fan activation based on coolant temperature. The switch uses a male connector and 3-terminal layout, with an M14 x 1.50 threaded fitting for the specified installation point. As part of the Four Seasons Temperature Switch product line, it is built for direct-fit replacement service where accurate fan engagement is required. This part cross-references BMW 61318376440 and TFS251 for the same application.
What This Part Helps Address
- Cooling fan not switching on at the correct temperature
- Cooling fan cycling at the wrong temperature thresholds
- Radiator-mounted temperature switch failure
- Overheating caused by delayed fan activation
- Electrical connection issues at the fan temperature switch
Installation Notes and Tips
Install the 37838 temperature switch at the radiator mount using the correct M14 x 1.50 threaded connection. Verify connector shape, terminal count, and fitting style before installation to match the existing BMW harness and switch location. Confirm the vehicle uses the listed temperature activation points and radiator-mounted configuration before replacement.
Fits 1997-1999 BMW 318ti, N/A. Fits 1996-1998 BMW Z3, N/A. Fits 1997 BMW 318i, N/A.
Quality Assurance
Four Seasons lists this temperature switch as meeting or exceeding OEM requirements for the specified application.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1999 | BMW | 318ti | N/A | Temperature Switch |
| 1998 | BMW | 318ti | N/A | Temperature Switch |
| 1998 | BMW | Z3 | N/A | Temperature Switch |
| 1997 | BMW | 318i | N/A | Temperature Switch |
| 1997 | BMW | 318ti | N/A | Temperature Switch |
| 1997 | BMW | Z3 | N/A | Temperature Switch |
| 1996 | BMW | Z3 | N/A | Temperature Switch |
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