Coolant Temperature Switch (Sensor) Replacement at your home or office.

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How much does Coolant Temperature Switch (Sensor) Replacement cost?

It depends on the type of car you drive and the auto repair shop you go to. Our mechanics are mobile, which means they don't have the overhead that repair shops have. They provide you convenience by coming to your home or office.

Car Labor Cost Parts Cost Estimate Average Dealer Price Savings
2004 Mitsubishi Lancer $70.00 $19.18 $89 $126.68 29%
2003 Ford F-250 Super Duty $70.00 $39.58 $110 $147.08 25%
2002 Mercury Mountaineer $182.00 $19.18 $201 $298.68 32%
2008 Ford F-150 $70.00 $44.38 $114 $151.88 24%
2007 Ford F-350 Super Duty $70.00 $44.38 $114 $151.88 24%
2002 Acura MDX $70.00 $53.98 $124 $161.48 23%
2003 Audi A4 Quattro $98.00 $14.40 $112 $164.90 31%
2002 Audi A8 Quattro $105.00 $14.40 $119 $175.65 32%
2003 Mercedes-Benz CL55 AMG $70.00 $35.98 $106 $143.48 26%
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Coolant Temperature Switch (Sensor) Replacement Service

What is the Coolant Temperature Switch (Sensor) all about?

The coolant temperature switch, also called the coolant temperature sensor, is a switch that reads the engine coolant temperature and sends a signal to the engine control module, or ECM, to control other functions of engine operation such as the air-fuel ratio.

It is also called a switch because on some cars, it is used to turn on the engine cooling fan at a specific temperature. This aids in the engine warm-up process as well as keeping the engine at a safe operating temperature.

Keep in mind:

  • The coolant temperature switch is a crucial part of the cooling system. If faulty, it can cause severe internal engine damage due to overheating, incorrect air-fuel ratio, or incorrect ignition timing. It can also cause shorter life to the cooling fan motor or other electrical components of the cooling system.
  • Some vehicles are equipped with a separate sensor to display the engine temperature to the driver via the temperature gauge.

How it's done:

  • The Coolant Temperature Switch is verified that it needs to be replaced. The coolant is drained until the switch is exposed.

  • The defective Coolant Temperature Switch is removed by disconnecting the connector and removing it from the manifold.

  • The new Coolant Temperature Switch is installed into the mounting hole in the manifold and the electrical connector is reconnected. The coolant is then refilled.

  • The Coolant Temperature Switch is tested for operation, codes cleared, and retested to ensure all codes have been resolved.

  • The vehicle is road tested to ensure proper operation of the Cooling System.

Our recommendation:

If you suspect that your coolant temperature switch has failed, have one of our licensed mechanics come out immediately to diagnose the problem.

What common symptoms indicate you may need to replace the Coolant Temperature Switch (Sensor)?

  • Check Engine light on
  • Engine overheating
  • Cooling fan runs intermittently
  • Engine misfires, stalls, or idles roughly
  • Erratic coolant temperature

How important is this service?

This part, when faulty, could cause the fan to run intermittently or not at all, which in turns causes overheating or overuse of the cooling fan motor. Whenever overheating occurs, severe engine damage is a possibility.

The engine air-fuel ratio is what keeps it running smoothly. If the ratio gets skewed, the engine will have poor fuel economy and run poorly or not at all. The coolant temperature switch is important because it gives the ECM the information it needs to make this calculation and run the engine optimally. YourMechanic will be able to tell you if this part is performing correctly.

Fast and easy Coolant Temperature Switch (Sensor) Replacement service at your home or office.

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People say the nicest things



Milton was great! Called to let me know when he'd be arriving. Very friendly & very thorough with his explanations. Took his time to make sure, double, triple check that everything was running properly. Very pleasant experience!



Very impressed with the quality of work. Ned was on time and on budget. There were no surprise extra costs. Ned even helped me out with my other car, even though I didn't have an appointment for the other car. He took care of all of my car problems and he even found me a coupon for an oil change. I will be using this service again.



Stephen was very professional and spoke to me in terms that I understood. Although the news about the car was not great, he explained the why's and what it would take to fix it. I will call on him again. Many thanks!


How can we help?

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1-800-701-6230 · hi@yourmechanic.com