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400974 41-8547 Temperature Sensor Kit for Thermo King
The 400974 / 41-8547 Temperature Sensor is a replacement graded temperature sensor for selected Thermo King transport refrigeration units. It provides accurate temperature feedback to the refrigeration control system.
Product Description
The 400974 Temperature Sensor for Thermo King is a graded temperature sensor used in transport refrigeration systems. Thermo King lists part 400974 as a KIT SENSOR GRADED. The part also replaces the earlier 400871 number.
This sensor measures temperature at the designated sensing point and sends temperature information to the refrigeration controller. Accurate temperature feedback helps the refrigeration unit manage cooling and maintain the required operating temperature.
The sensor is commonly identified by several part numbers, including 400974, 40-0974, 40-974, 40974 and 41-8547. Other related numbers include 400871, 40-0871, 41-4022 and 41-2649.
The 400974 / 41-8547 Temperature Sensor appears in applications across several Thermo King product families, including selected SLXi, SLX, SL, SB, TS, SMX, Super, KD, MD, RD, SLXe, UTS and T-Series units. Exact compatibility depends on the unit model and configuration.
Product Specifications
| Item | Specification |
|---|---|
| Product Type | Temperature Sensor |
| Sensor Type | Graded Temperature Sensor |
| Main Part Number | 400974 |
| Common Cross-Reference | 41-8547 |
| Other Part Numbers | 40-0974, 40-974, 40974, 40-0871, 400871 |
| Application | Thermo King Transport Refrigeration |
| Function | Temperature Measurement and Feedback |
| Equipment | Truck and Trailer Refrigeration Units |
| Main Series | SLXi, SLX, SL, SB, TS, T-Series, MD, RD, KD, SMX |
| Condition | Aftermarket Replacement |
Thermo King identifies 400974 as a Kit Sensor Graded, while aftermarket catalogs commonly list it as a graded temperature sensor.
Main Function
- Measures refrigeration system temperature
- Provides temperature feedback to the controller
- Supports accurate temperature regulation
- Helps control refrigeration operation
- Supports system monitoring and diagnostics
- Helps maintain stable cargo temperatures
Common Replacement Symptoms
A faulty temperature sensor may cause:
- Incorrect temperature readings
- Unstable temperature display
- Temperature-related alarm codes
- Difficulty maintaining the set temperature
- Abnormal cooling operation
- Incorrect refrigeration control
- Intermittent temperature signals
These symptoms can also come from wiring, connectors, or controller problems. Check the complete sensor circuit before replacement.
Thermo King Applications
| Series | Common Applications |
|---|---|
| SLXi | SLXi 100, 200, 300, 400, Spectrum and selected Whisper Pro models |
| SB | SB 100, 110, 190, 200, 210, 230, 300, 310, 400 and selected Multi-Temp models |
| SLX | SLX 100, 200, 300, 400, Spectrum and selected Whisper models |
| SL | SL 100, 200, 300, 400, 100e, 200e, 400e, Spectrum and Multi-Temp |
| TS | TS 200, 300, 500, 600 and selected XDS applications |
| T-Series | Selected 600R, 800R, 1000R, 1200R and Spectrum models |
| MD | Selected MD, MD-II, MD-100, MD-200 and MD-300 |
| RD | Selected RD-II and RD-II SR |
| KD / Super | Selected KD-II and Super II |
| SMX | Selected SMX and related refrigeration units |
| SLXe | Selected SLXe 200, 300, 400 and Spectrum |
| UTS | Selected UTS applications |
Public parts catalogs show a broad application range for 400974 / 41-8547. Always confirm the original part number and unit model before ordering.
Cross-Reference Part Numbers
| Part Number | Reference |
|---|---|
| 400974 | Main Thermo King part number |
| 40-0974 | Common formatted number |
| 40-974 | Short formatted number |
| 40974 | Number without hyphen |
| 41-8547 | Common cross-reference |
| 418547 | Number without hyphen |
| 40-0871 | Related / previous number |
| 400871 | Number without hyphen |
| 41-4022 | Related reference |
| 41-2649 | Related reference |
| 41-3852 | Related catalog reference |
| 41-4013 | Related catalog reference |
| 41-5801 | Related catalog reference |
| 41-7084 | Related catalog reference |
Thermo King and aftermarket catalogs show these numbers within the same sensor family. However, not every listed number should be treated as interchangeable without checking the specific unit application.
Similar Thermo King Temperature Sensors
400975 / 41-8548 Temperature Sensor
The 400975 / 41-8548 sensor belongs to another Thermo King temperature-sensor group. It is commonly described as an ungraded coil / return-air temperature sensor. Do not automatically interchange it with 400974 / 41-8547.
41-6538 Water Temperature Sensor
The 41-6538 sensor monitors engine water/coolant temperature on selected Thermo King units. It has a different sensing application.
41-6539 Water Temperature Sensor
The 41-6539 sensor also serves engine water temperature applications and differs from the 400974 / 41-8547 refrigeration temperature sensor.
Suitable Customers
This temperature sensor is suitable for:
- Thermo King parts distributors
- Transport refrigeration parts wholesalers
- Reefer repair companies
- Fleet maintenance companies
- Thermo King service providers
- Aftermarket refrigeration parts importers
Ordering Information
Please provide the following information before ordering:
- Original part number
- Thermo King unit model
- Unit serial number, if available
- Sensor installation position
- Connector and wire configuration
- Photos of the original sensor when necessary
This information helps confirm the correct replacement.
