Cooling Systems Sensors, Switches Relays

Cooling System Switches, Sensors & Relays

  • ACDelco® - GM Original Equipment™ Engine Coolant Temperature Sensor
    ACDelco®GM Original Equipment™ Engine Coolant Temperature Sensor
    0
    # sp11745
    GM Original Equipment™ Engine Coolant Temperature Sensor by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and...
    Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
    $7.85 - $190.85
  • Standard® - Engine Coolant Temperature Sensor
    Standard®Engine Coolant Temperature Sensor
    0
    # sp153620
    Engine Coolant Temperature Sensor by Standard®. SMP's vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest reputation for integrity to...
    Global manufacturer of automotive aftermarket productsDirect-fit OE replacement that ensures ease of installation
    $5.28 - $123.36
  • NTK® - Engine Coolant Temperature Sensor
    NTK®Engine Coolant Temperature Sensor
    0
    # sp183061
    Engine Coolant Temperature Sensor by NTK®. Designed utilizing the latest technology, this product by NTK features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to...
    Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement
    $8.07 - $244.80
  • Beck Arnley® - Temperature Sensor
    Beck Arnley®Temperature Sensor
    0
    # sp17036
    Temperature Sensor by Beck Arnley®. When investing in this superior product by Beck Arnley, expect to get the exact OEM look, function, and fit. The product was developed to stringent factory specifications and crafted using...
    OE quality products from top original equipmentTop quality materials
    $8.63 - $46.35
  • Standard® - Engine Coolant Temperature Sender
    Standard®Engine Coolant Temperature Sender
    1
    # sp17400
    Engine Coolant Temperature Sender by Standard®. Standard is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest reputation for integrity to all...
    OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
    $6.07 - $69.73
  • Delphi® - Engine Coolant Temperature Sensor
    Delphi®Engine Coolant Temperature Sensor
    0
    # sp214515
    Engine Coolant Temperature Sensor by Delphi®. Increase the life of your vehicle's engine by keeping your cooling system in top condition. Replace your faulty engine cooling component with this highly efficient replacement product and be...
    Delphi temperature sensors are built with the latest OE technologySensors use durable, one-piece design
    $11.10 - $47.15
  • ACDelco® - Professional™ Engine Coolant Temperature Sensor
    ACDelco®Professional™ Engine Coolant Temperature Sensor
    0
    # sp105190
    Professional™ Engine Coolant Temperature Sensor by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle,...
    Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
    $17.79 - $85.02
  • Motorcraft® - Engine Coolant Temperature Sensor
    Motorcraft®Engine Coolant Temperature Sensor
    1
    # sp114813
    Engine Coolant Temperature Sensor by Motorcraft®. With today's complicated automotive engines, it is crucial to have the right cooling system components for accurate temperature control, pressure relief, and gasket seals. Motorcraft is...
    Made to keep your vehicle's engine running coolDesigned to maintain proper cooling level and prevent overheating
    $14.32 - $122.32
  • gpd® - Engine Coolant Temperature Sensor
    gpd®Engine Coolant Temperature Sensor
    0
    # sp227986
    Engine Coolant Temperature Sensor by gpd®. Want to keep your vehicle performing reliably? Then premium gpd aftermarket auto parts are right up your alley. They are manufactured from superior-quality materials and feature solid...
    Designed to meet/exceed OE fit, form and functionDurability tested on every new design
    $6.25 - $343.68
  • Facet® - Engine Coolant Temperature Sensor
    Facet®Engine Coolant Temperature Sensor
    0
    # sp124014
    Engine Coolant Temperature Sensor by Facet®. The electronic engine management system has become a fundamental element in modern motor vehicles. It works to prevent failures that might seriously compromise the safety of the driver....
    The reliable goods for increase of reliability of the carQuality equal, if not superior, to that of the original components
    $7.11 - $28.24
  • Walker Products® - Engine Coolant Temperature Sender
    Walker Products®Engine Coolant Temperature Sender
    0
    # sp206349
    Engine Coolant Temperature Sender by Walker Products®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and...
    High quality at an affordable priceExpertly made from premium materials
    $4.75 - $93.06
  • Walker Products® - Engine Coolant Temperature Sensor
    Walker Products®Engine Coolant Temperature Sensor
    0
    # sp206350
    Engine Coolant Temperature Sensor by Walker Products®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and...
    High quality at an affordable priceExpertly made from premium materials
    $6.32 - $137.13
  • Vemo® - Engine Coolant Temperature Sensor
    Vemo®Engine Coolant Temperature Sensor
    0
    # sp138655
    Engine Coolant Temperature Sensor by Vemo®. Increase the life of your vehicle's engine by keeping your cooling system in top condition. Replace your faulty engine cooling component with this highly efficient replacement product and be...
    Made to keep your vehicle's engine running coolDesigned to maintain proper cooling level and prevent overheating
    $6.48 - $161.50
  • ACDelco® - Professional™ Engine Coolant Temperature Sender
    ACDelco®Professional™ Engine Coolant Temperature Sender
    0
    # sp16994
    Professional™ Engine Coolant Temperature Sender by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle,...
    Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
    $15.16 - $53.65
  • SKP® - Engine Coolant Temperature Sensor
    SKP®Engine Coolant Temperature Sensor
    0
    # sp206339
    Engine Coolant Temperature Sensor by SKP®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...
    Precise engineering ensures second to none quality and lasting valueStringently tested with the highest quality standards
    $2.36 - $20.32
  • Standard® - Tru-Tech™ Engine Coolant Temperature Sender
    Standard®Tru-Tech™ Engine Coolant Temperature Sender
    1
    # sp5483
    Tru-Tech™ Engine Coolant Temperature Sender by Standard®. When you're low on oil, coolant or some other fluid, you may be tempted to just run down to the local auto parts chain store. But before you waste your time and gas only to...
    The terminal is manufactured with high grade materialsThe housing is fabricated using polyamide resins
    $6.45 - $14.72
  • WVE® - Engine Coolant Temperature Sender
    WVE®Engine Coolant Temperature Sender
    0
    # sp183070
    Engine Coolant Temperature Sender by WVE®. Replace your worn-out or faulty component with this quality replacement from WVE. This product is designed and tested to ensure the ultimate in durability and functionality. Made to meet or...
    Excellent replacement for your worn-out factory partDesigned to keep your vehicle running reliably mile after mile
    $4.85 - $409.37
  • ACDelco® - Genuine GM Parts™ Engine Coolant Temperature Sensor
    ACDelco®Genuine GM Parts™ Engine Coolant Temperature Sensor
    0
    # sp223713
    Genuine GM Parts™ Engine Coolant Temperature Sensor by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your vehicle and...
    Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle
    $16.38 - $59.93
  • Mopar® - Engine Coolant Temperature Sensor
    Mopar®Engine Coolant Temperature Sensor
    0
    # sp114778
    Engine Coolant Temperature Sensor by Mopar®. Extend the service life of your engine and make it running smoothly with this high-quality product by Mopar. This part was specially designed to maintain the efficiency and performance of...
    Carefully crafted from premium materialsExcellent corrosion and wear resistance
    $17.30 - $326.87
  • Crown® - Coolant Temperature Sensor
    Crown®Coolant Temperature Sensor
    0
    # sp8833
    Coolant Temperature Sensor by Crown®. Crown Automotive is just the ticket if you want to get the most out of your vehicle as well as revel in a more exciting driving experience. You will surely get a real bang for the buck!
    Developed to improve your driving experienceConstructed to ensure ultimate operation
    $17.39 - $49.62
  • Standard® - Tru-Tech™ Engine Coolant Temperature Sensor
    Standard®Tru-Tech™ Engine Coolant Temperature Sensor
    0
    # sp5484
    Tru-Tech™ Engine Coolant Temperature Sensor by Standard®. When you're low on oil, coolant or some other fluid, you may be tempted to just run down to the local auto parts chain store. But before you waste your time and gas only to...
    OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
    $6.80 - $23.42
  • Original Equipment® - Engine Coolant Temperature Sensor
    Original Equipment®Engine Coolant Temperature Sensor
    0
    # sp251276
    Engine Coolant Temperature Sensor by Original Equipment®. Looking for high-quality replacement parts to restore the performance of your vehicle? Then Original Equipment automotive parts are for you. They are manufactured from the finest...
    Perfect replacement for your damaged or worn out original partMade using high-grade materials for long-lasting dependability
    $19.47 - $69.16
  • Febi® - Water Temp Sensor
    Febi®Water Temp Sensor
    1
    # sp245046
    Water Temp Sensor by Febi®. This Febi product is designed to help you restore your engine cooling system to its mint condition, so your motor can run within the proper temperature window required for its safe and efficient operation....
    Designed to replace your factory productMade from the same grade material as your OE part
    $7.82 - $28.52
  • Forecast® - Engine Coolant Temperature Sensor
    Forecast®Engine Coolant Temperature Sensor
    0
    # sp138725
    Engine Coolant Temperature Sensor by Forecast®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver...
    Made to keep your vehicle's engine running coolDesigned to maintain proper cooling level and prevent overheating
    $17.45 - $59.95
  • Genuine® - Engine Coolant Temperature Sensor
    Genuine®Engine Coolant Temperature Sensor
    0
    # sp138684
    Engine Coolant Temperature Sensor by Genuine®. If your engine cooling system is in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain...
    Designed to restore your vehicle’s engine cooling systemGenuine OE replacement parts from the OE manufacturer
    $15.32 - $165.63
  • Four Seasons® - Coolant Temperature Sensor
    Four Seasons®Coolant Temperature Sensor
    1
    # sp114841
    Coolant Temperature Sensor by Four Seasons®. Products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile A/C experience, fix it once and fix it right with Four Seasons.
    OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
    $9.05 - $223.81
  • Four Seasons® - Engine Coolant Temperature Sender
    Four Seasons®Engine Coolant Temperature Sender
    0
    # sp105199
    Engine Coolant Temperature Sender by Four Seasons®. All products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of car parts experience, fix it once and fix it right with Four Seasons.
    OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
    $11.75 - $145.97
  • URO Parts® - Engine Coolant Temperature Sensor
    URO Parts®Engine Coolant Temperature Sensor
    1
    # sp12880
    Engine Coolant Temperature Sensor by URO Parts®. This superior part by URO is a great alternative solution to the costly factory equipment that will help you restore smooth and efficient operation of your vehicle. Thoroughly designed...
    Designed to replace your worn out factory cooling partOptimizes engine cooling performance
    $4.82 - $45.11
  • Beck Arnley® - Temperature Switch
    Beck Arnley®Temperature Switch
    1
    # sp17040
    Temperature Switch by Beck Arnley®. For one hundred years, Beck Arnley has been providing premium OE quality parts for vehicles. Beginning with motorcycle parts in 1914 and transitioning to import vehicles in the 1950’s, brand...
    OE quality products from top original equipmentTop quality materials
    $5.00 - $20.02
  • Standard® - Intermotor™ Engine Coolant Temperature Sensor
    Standard®Intermotor™ Engine Coolant Temperature Sensor
    1
    # sp182935
    Intermotor™ Engine Coolant Temperature Sensor by Standard®. SMP's vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest reputation...
    OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
    $9.82 - $292.15




The way many systems operate in your vehicle is dependent on the engine coolant temperature, making cooling system switches and sensors very important parts. These components provide an input to the engine control module (ECM), which in turn regulates fuel, ignition and other vehicle functions based on temperature and the input from other sensors. Coolant sensors and switches are threaded into coolant passages, where they are directly exposed to coolant for the most accurate temperature measurement in order to provide the engine control module with real time data.

Coolant switches are used when a simple on/off signal is needed, as in the early fuel evaporation (EFE) system, which is used on some carbureted vehicles to heat the fuel mixture when the engine is cold to improve vaporization. In this system, a plate, with a heater grid under one or both carburetor barrels, is installed between the carburetor and the intake manifold. A temperature switch grounds the EFE circuit when the vehicle is cold and a relay supplies power to the heater grid. When the engine reaches a specified operating temperature, the switch opens, deactivating the relay and shutting off the heater grid.

When a range of coolant temperature data is required, a coolant temperature sensor is needed. A common use for these data would be for a temperature gauge. Most coolant temperature sensors are thermistors, which change resistance according to temperature. Most of these are NTC (negative temperature coefficient) thermistors, which decrease resistance as temperature increases. The ECM sends a 5-volt reference voltage to the sensor and the sensor’s resistance reduces the voltage sent back to the computer. The temperature is calculated by the ECM based on the return voltage.

The ECM uses temperature data from the coolant temperature sensor to: vary injector pulse width, increasing on-time for a richer mixture when the engine is cold, and decreasing on-time as the engine warms up; increase idle speed when the engine is cold, to prevent stalling; and turn the electric cooling fan on and off. In addition, coolant temperature information is critical because certain component function must only be enabled when the engine is warm. These include the EGR (exhaust gas recirculation) system, which would cause the engine to run rough and stall if exhaust gas was introduced to the intake when the engine is cold; the evaporative emissions control purge valve; and the transmission torque converter clutch.

Some of the engine cooling system components, for example, a radiator fan, draw a high current from the power source. If you connect them directly or using a switch to the alternator or the battery, it may cause a short circuit, which can result in a fire or damage to the battery. To avoid such a turn of events, virtually all electric engine cooling system components are connected to the circuit through a relay. It is a small electromagnetic switch operated by a relatively small electric current that can turn on or off a much larger electric current. This allows to power any energy-intensive devices without running the risk of damaging the battery or other vehicle components. Relays vary in size and construction, while their operating principle remains the same.

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Cooling System Switches, Sensors & Relays Reviews

40 reviews
This sensor fulfills all my expectations. It’s cheaper than OEM but works superbly! Fits just like the part that originally came with my car.
Posted by Michael (Las Vegas, NV) / January 07, 20212013 Volkswagen Golf GTI
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