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Coolant Temperature Sensor Operation:

This sensor monitors the temperature of the engine and sends that information to the engine control computer to regulate the amount of fuel needed. More fuel is needed if the engine is cold; less if it's hot. If the temperature is extreme, the signal will be sent to the temperature gauge as a visual indicator of overheating and imminent danger.

See below how this sensor looks:---

Inspect the sensor's wires and connections. ECT (engine coolant temperature) sensor problems are often caused by faulty wiring or loose or corroded connections rather than the failure of the sensor itself.

If the wires or connections are bad, replace them. If you think the sensor is defective, it should be tested.

WARNING

Never apply an open flame to an ECT (engine coolant temperature) or IAT (intake air temperature) sensor for test purposes. This action will damage the sensor.

A defective ECT sensor may cause some of the following problems:

Hard engine starting
Rich or lean air/fuel ratio
Improper operation of emissions devices
Reduced fuel economy
Improper converter clutch lockup
Hesitation on acceleration
Engine stalling

The ect sensor may be removed and placed in a container of water with an ohmmeter connected across the sensor terminals. a thermometer is also placed in the water. when the water is heated, the sensor should have the specified resistance at any temperature. if the sensor does not have the specified resistance, replace the sensor.

The wiring to the sensor can also be checked with an ohmmeter. With the wiring connectors disconnected from the ECT sensor and the computer, connect an ohmmeter from each sensor terminal to the computer terminal to which the wire is connected. Both sensor wires should indicate less resistance than specified by the vehicle manufacturer. If the wires have higher resistance than specified, the wires or wiring connectors must be repaired.

WARNING

Before disconnecting any computer system component, be sure the ignition switch is turned off. Disconnecting components may cause high induced voltages and computer damage.

With the sensor installed in the engine, the sensor terminals may be backprobed to connect a digital voltmeterto the sensor's terminals. the sensor should provide the specified voltage drop at any coolant temperature.

Voltage drop specifications for an ECT sensor.

Some computers have internal resistors connected in series with the ECT sensor. The computer switches these resistors at approximately 120° F (49° C). This resistance change inside the computer causes a significant change in voltage drop across the sensor, as indicated in the specifications. This is a normal condition on any computer with this feature. This change in voltage drop is always evident in the vehicle manufacturer's specifications.

Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. You may need to partially drain the engine coolant to prevent coolant spillage.

Disconnect the negative battery cable.
Unplug the ECT.
Then, unscrew it.
Reverse the removal procedures to install the new part.
Connect the negative battery cable to the battery.

This details will help.

Thanks

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If you need dis-assembly or replacement instructions for any other auto/car part, or you want to ask question related to your car/truck jeep problem then please leave the comment with your details, so I can provide you the required instructions and solutions.

The procedure is as follows :---

Radiator

REMOVAL & INSTALLATION

See Figures 1 through 6

Fig. Fig. 1: View of the upper radiator hold-down bracket and bolt

Fig. Fig. 2: It may be necessary to move an A/C line out of the way for easier radiator removal

Fig. Fig. 3: Using a pair of pliers, squeeze the spring clip to remove the clamp

Fig. Fig. 4: Disengage the connector to release the wiring harness

Fig. Fig. 5: The lower radiator hose at the radiator may be hard to reach, as shown on this Integra model. If this is the case, remove the hose at the other end where it may be more accessible

Fig. Fig. 6: Thread the radiator bolts in by hand to avoid cross-threading them

Disconnect the negative battery cable.

CAUTION

Do not open the radiator draincock or remove the radiator cap when the cooling system is hot and under pressure. This can cause serious burns from hot, pressurized coolant. Allow a sufficient amount of time for the cooling system to cool down before opening up the system.

Loosen the radiator drain plug and, using a large capacity container, drain the cooling system.

Remove the radiator cap.

Disconnect the upper radiator hose.

It is recommended that each clamp be matchmarked to the hose. Observe the marks and reinstall the clamps in exactly the same position when reinstalling the radiator.

Remove the radiator hoses.

Label and disengage the wiring from the thermosensors and the electric fan assemblies.

For vehicles with automatic transaxles, disconnect the oil cooler lines at the radiator. Plug the transaxle ports and the hose ends to contain the fluid and prevent contamination.

Remove the radiator. Be careful not to damage the radiators cooling fins while removing the unit. While the radiator is not heavy, it may be awkward. Use both hands to steady it during removal and installation