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SKU:
ZZ3F05199
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40-974 Graded Sensor Air Temperature Fit Thermo King MD-200 RAC-4 MD-MT TA-1100
$59.19
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$59.19
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$59.19
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Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
Air Temperature Sensor for Thermo King
This 40-974 graded sensor air temperature component is a direct replacement sensor designed to monitor and relay air temperature readings within Thermo King refrigeration units, ensuring accurate climate control and system performance. Built as a service-grade part, it matches the functional specifications of OEM reference 40-974 for dependable operation in demanding transport refrigeration environments.
Overview
This 40-974 graded sensor air temperature unit measures ambient air temperature and sends the signal to the Thermo King controller, allowing the system to regulate cooling and heating cycles precisely. It is intended for technicians and fleet operators maintaining Thermo King MD-200, RAC-4, MD-MT, and TA-1100 units, and serves as a direct replacement for the original sensor. The 40-974 graded sensor air temperature construction is built for long service life in vibration-prone, temperature-extreme mounting locations.
Built For Performance
- Replacement sensor with OEM cross-reference 40-974
- Graded sensing element for consistent temperature response
- Direct-fit electrical connector matches factory harness
- Corrosion-resistant housing protects against moisture and road salts
- Wide operating temperature range suited for reefer applications
- Plug-and-play installation without calibration
Fits These Machines
- For Thermo King MD-200
- For Thermo King RAC-4
- For Thermo King MD-MT
- For Thermo King TA-1100
On-The-Job Use
- Replaces failed sensors in trailer and truck refrigeration units
- Used in routine preventive maintenance of Thermo King systems
- Ideal for mobile cold-chain fleets requiring accurate temperature logging
- Fits in evaporator or return-air sensor locations
Specs At A Glance
| Part Number(s) | 40-974 |
| Sensor Type | Graded air temperature |
| Compatible Systems | Thermo King MD-200, RAC-4, MD-MT, TA-1100 |
| Connection | OEM-style plug |
Good To Know
Q: Will this sensor work if my unit's wiring harness has a different connector? A: This sensor uses the factory-style connector for the listed Thermo King models, but verify your harness connector matches before ordering, as late-production units may vary.
Q: How do I know if this sensor has failed? A: Typical symptoms include erratic temperature display, compressor short-cycling, or fault codes on the controller. Testing resistance across the sensor terminals and comparing to the spec table will confirm.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.