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What size thread is a GM coolant temperature sensor?

The typical thread size for a GM coolant temperature sensor is M12 x 1.5. This means the sensor has a diameter of 12 millimeters and a thread pitch of 1.5 millimeters per thread.


Detailed Explanation


Coolant temperature sensors are an important component in the engine cooling system of vehicles, including those manufactured by General Motors (GM). These sensors measure the temperature of the engine coolant and relay this information to the vehicle's computer, which uses it to optimize engine performance and fuel efficiency.


The thread size of a coolant temperature sensor is an important specification, as it determines how the sensor is mounted and sealed in the engine block or coolant system. The M12 x 1.5 thread size is a common standard used by GM and other automakers for these types of sensors.



  • M12 refers to the diameter of the sensor, which is 12 millimeters.

  • 1.5 refers to the thread pitch, which is the distance between each thread. In this case, it is 1.5 millimeters per thread.


This thread size allows the coolant temperature sensor to be securely mounted and sealed in the engine block or coolant system, ensuring accurate temperature readings and preventing coolant leaks.


Importance of Proper Thread Size


Using the correct thread size for a coolant temperature sensor is crucial for proper installation and operation. If the thread size is incorrect, the sensor may not fit properly or seal correctly, leading to issues such as coolant leaks, inaccurate temperature readings, and potential engine damage.



  • Improper fit can cause the sensor to become loose or misaligned, leading to inaccurate temperature readings.

  • Coolant leaks around the sensor can result in loss of coolant, which can cause the engine to overheat.

  • Incorrect thread size may also prevent the sensor from being tightened securely, leading to vibration and potential sensor failure.


Therefore, it is essential to use a coolant temperature sensor with the correct M12 x 1.5 thread size when replacing or servicing this component on a GM vehicle.

Are all TRV valves the same size?


Most modern systems use 15mm valves, but adapters can be used for different sizes. Checking the thread size is also essential to ensure a secure fit.



What size threads are on a coolant temperature sensor?


5 to 1/8 NPT for most temp sensors.



Are all radiator thermostats the same size?


15mm valves are the only size you're likely to encounter, since 15mm copper pipes are the most common. There are also other sizes, from 8mm to 28mm, and there are accompanying adapters.



What size thread is a radiator thermostat?


1/2 inch BSP
Radiators usually have a 1/2 inch BSP female threaded connection for the valve (see BSPT link at bottom of page for more info on plumbing thread sizes).



What is the thread pitch of a GM temperature sensor?


3/8 npt
coolant temp sensor. G.M. sensors are 3/8 npt.



Are there 2 coolant temperature sensors?


There are two temperature sensors in some vehicles, one to send information from the engine system to the control unit and another from the control unit to the dashboard. The device follows the principle of dependence of potential difference in temperature.



What do you use for radiator threads?


The vast majority of plumbers or heating professionals will endorse the use of PTFE tape and jointing compound for any new heating installations.



What size is the thread on a GM IAT sensor?


Thread size of GM IAT sensor?? Be the first to like this post. It is 3/8 NPT which is a tapered thread.



What size thread is a 22r coolant temp sensor?


Cliff notes: thread pitch you need is M16x1. 5, but you need a bottoming tap.



What size is the thread on a TRV?


The dimension across the diameter of the thread should measure 30mm and the 'thread pitch' should measure 1.5mm (thread pitch is the measurement of one thread to the next).


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.