I could be the sensor, a hose, a gasket, and other things as well. What we need to do is confirm where the leak is coming from, so we know how to fix it. What I would first suggest is to remove the coolant that is in the pic and dry everything off. Next, follow the link below.
If you are unable to find the leak, then you should pressure test it. You will need a pressure tester to do this. Basically, you pressurize the system when the engine is cold. That way you can take your time and not get burnt. When pressurized. if you cleaned everything off, you should be able to see where the leak is coming from.
As far as the pressure tester, most parts stores will lend one to you, so don't worry about where you will find one.
Here is a link that shows how the procedure is done:
If that fails to help you find the leak, the next step would be to add a dye to the coolant and run the engine until you notice coolant again. Then, using a black light, shine it where the leak could be coming from. The coolant will illuminate, and you should be able to trace it to the source.
Let me know if you have questions or need help. Also, if possible, let me know what you find.
Friday, November 5th, 2021 AT 8:46 PM