Location of coolant temperature sensor on a 2007 Volkswagen Rabbit with the 2.5L 5 cylinder engine.

The coolant temperature sensor on a 2017 Volkswagen Passat is typically located on or near the engine. It monitors the temperature of the engine coolant and sends this information to the engine control unit (ECU) to help regulate the engine's performance and fuel efficiency.
In the case of the 2017 Volkswagen Passat, the coolant temperature sensor is located on the engine block. To access it, you may need to remove some engine covers or components to reach the sensor. The exact location can vary depending on the engine type and model specifications.
For a more accurate and detailed location, it is recommended to refer to the vehicle's service manual or consult a qualified mechanic. They can provide you with specific instructions for locating and replacing the coolant temperature sensor on your 2017 Passat model. Additionally, if you are not familiar with automotive repair and maintenance, it is advisable to seek professional assistance to avoid causing any damage to the vehicle.

Question edited for clarity.

Hoses should never leak. Answered on Fixya here with diagram.

https://www.fixya.com/cars/t16882243-location_ect_sensor_in_mazda_5_year_2006

More here and videos as well.

https://www.google.com/search?q=2013+mazda+5+sport+engine+coolant+temperature+sensor+location

..

The Engine Coolant Temperature Sensor is located in the coolant pipe, below the air intake pipe and behind the right cylinder head and is integral with the ECT sensor. The Engine Coolant Temperature Sensor is located on the back of the right cylinder head and is integral with the ECT sensor.
https://www.autozone.com/repairguides/Audi-Cars-1999-05/Component-Locations/Engine-Coolant-Temperature-ECT-Sensor/_/P-0900c152801c0f85

This is for cc sport, 2.0L engine. #9 appears to be water/coolant pump. #7 shows to be coolant temp sensor. Hope this helps.

Engine Coolant Temperature (ECT) Sensor (LP1/LY7)
In the engine compartment, in the left side of the left cylinder head, between cylinders #2 and #4

Engine Coolant Temperature (ECT) Sensor (LS2)
In the engine compartment, towards the front of the left cylinder head, near #1 spark plug

At the rear of the right cyl head

Automobiles: 2000 Ford Escort ZX2 4-cylinder 2.0L MFI DOHC

NOTE
The "left" side of the engine is the driver's side.

The Engine Coolant Temperature (ECT) sensor is a thermistor (a device which changes resistance or voltage as temperature changes). The sensor detects the temperature of engine coolant and provides a corresponding signal to the PCM (Powertrain Control Module - aka "the car's computer").

The ECT sensor is mounted in the following locations (small Ford engines):

1.8L engines: in the cylinder head
1.9L engines: threaded into the heater hose inlet pipe
2.0L engines: at the left rear of the engine

2.0L Zetec Engine

(1) Partially drain the engine cooling system using a clean container. If coolant is in good condition, retain for reuse.
(2) Disconnect the battery ground cable.
(3) Disconnect the electrical wiring connector from the engine coolant temperature (ECT) sensor.
(4) Remove the retaining clip and the ECT sensor.




Fig. 1 Escort ZX2 ECT sensor - The retaining clip is removed (at the solid arrow). Withdraw ECT sensor by gently wiggling/pulling in the direction of the dashed arrow.

To install:

NOTE
Coat the ECT sensor O-ring with clean coolant prior to installation.

(1) Replace the retaining clip and the ECT sensor.
(2) Connect the electrical wiring connector from the Engine Coolant Temperature (ECT) sensor.
(3) Connect the battery ground cable.
(4) Refill the engine cooling system. An inexpensive plastic "Radiator Funnel" will help with this task.

On left end of rear cylinder head

Coolant Temperature Sensor/Switch (For Computer): Service and Repair
ENGINE TEMPERATURE SENSOR
Removal




Engine temperature sensor, 5-cylinder
Jack up the car.
Remove protection cover from under engine.
Drain the coolant.
Lower the car.
Release coolant hose from thermostat housing using pliers.
Remove thermostat housing.
Remove sensor.




Engine temperature sensor, 6-cylinder
Jack up the car.
Remove protection cover from under engine.
Drain the coolant.
Lower the car.
Loosen oil reservoir for servo pump.
Remove coolant reservoir and put it to one side.
Remove screws and outer/upper timing-gear casing.
Remove screws and wire channel.
Disconnect connector.
Remove 4 screws and thermostat housing.
Remove sensor and wires.
Installation
Engine temperature sensor, 6-cylinder
Install thermostat housing sensor.
Position wires in slot on thermostat housing.
Note! The white marks should be positioned in lower opening of slot, from underneath.
Position gasket on thermostat housing correctly and install thermostat housing using two of the screws.
Position thermostat housing correctly and tighten the four screws.
Position wire channel correctly and position wire in channel.
Tighten screw on wire channel.
Connect the connector.
Install outer/upper timing-gear casing.
Install coolant reservoir.
Install oil reservoir for servo pump.
Follow-on work, 6-cylinder
Fill up coolant.
Warm the engine until the thermostat opens.
Switch engine oft and check the level. Re-fill if necessary.
Check for leaks.
Check in VADIS vehicle communication (read-out of parameter values), for current engine system, that the engine temperature shown appears
correct.
Engine temperature sensor, 5-cylinder
Install in reverse order.
Follow-on work, 5-cylinder
Fill up coolant.
Warm the engine until the thermostat opens.
Switch engine off and check the level. Re-fill if necessary.
Check for leaks.
Check in VADIS vehicle communication (read-out of parameter values), for current engine system, that the engine temperature shown appears
correct.