2016~2023 CX-9 Engine coolant temperature sensor

[sm1ke]

Hey guys, hoping to get some help from the community on this one. I can't seem to find the location of the coolant temperature sensor on the engine. Everything I could find on the Internet shows the location of the sensor on the previous gen, or the location of the sensor on a 2.5 non-turbo. Usually it's easily visible by the thermostat housing, but I can't seem to locate it on the 2.5T. To be fair, I haven't taken the battery out or anything, but I wanted to get an idea of where it is before I start ripping stuff out. Any ideas?

The part number of the sensor is SH01-18-840 if that helps.

 

[youri]

Not sure if this is helping but here is the location from the workshop manual (part#5):

It is under engine/ cooling system:
Post in thread '2016 and up CX-5 Service Manual'
2016 and up CX-5 Service Manual

 

[youri]

Also check the link for the procedure. The thermostat has a pin that needs to be aligned in the right orientation.

 

[sm1ke]

Thanks @youri. That's the location of the thermostat, which it seems I'll need to replace anyway. I'm thinking I'll need to remove the battery, intake piping, and battery tray to see the sensor, which sucks. I'll give it a shot tomorrow. Maybe I'll just replace the thermostat.. today I drove the car for a little while and after it got to operating temp, the upper coolant hose wasn't hot to the touch.

 

[youri]

Oh my bad. I thought you meant the thermostat. I didn’t realise they were difdefent things. How about this one then ? The ECT sensor (engine coolant temperature sensor) is number 9. It is under engine/control system in the manual.

 

[youri]

The manual says you only need to remove these items to remove it (in that order)
-drain the coolant
- plug hole plate ( the plastic engine cover)
- battery
-Air-inlet

So i think you should be able to see it without removing much, altough the inlet pipe may be in the way.

They also say you need a special socket to remove it though. (How special that socket is i am not really sure).

The manual also have a method to test the sensor (in heated water with a multimeter) to test the sensor and see if it works correctly.

 

[sm1ke]

Oh my bad. I thought you meant the thermostat. I didn’t realise they were difdefent things. How about this one then ? The ECT sensor (engine coolant temperature sensor) is number 9. It is under engine/control system in the manual.

View attachment 343328

View attachment 343327

Thanks, this is exactly what I was looking for. I had a feeling it might have been there - it was the only place I couldn't see that would still be near the thermostat. The special socket looks like its just a 12 point socket, but maybe the teeth are a bit different. I'll check later to see if I can just use one of my sockets. Most instructions for removing/installing ECT sensors mention using a basic 19mm socket.

Thanks for the tip on testing the sensor, I'll do that and if I can reuse the sensor, I should be able to return the one I bought.

Since I'll be replacing the thermostat anyway, I need to get coolant. If I remember right, we have to use the "new" FL-22 that is a 55/45 mix, so I decided to wait until today, when I can get some from the dealer. Looks like I'll need to get 3 jugs to make sure I have enough to refill, since 1 jug is 3.78L and the capacity is 9.8-9.8L.

@youri, can I ask where you found that info? I tried looking for a service manual for our cars and couldn't find a free one.

 

[youri]

It is here:

Post in thread '2016 and up CX-5 Service Manual'
2016 and up CX-5 Service Manual

Our CX-9 is the CX-9(TC). That is for the Australian version but they are almost identical (they have an extra oil cooler, but i think that is mostly it).

 

[sm1ke]

It is here:

Post in thread '2016 and up CX-5 Service Manual'
2016 and up CX-5 Service Manual

Our CX-9 is the CX-9(TC). That is for the Australian version but they are almost identical (they have an extra oil cooler, but i think that is mostly it).

Thanks youri, much appreciated! This should be really helpful.