Where is the Water Temperature Sensor Located on the Grand Cherokee?
2 Answers
Near the compensation water tank, the function of the water temperature sensor is to convert the cooling water temperature into an electrical signal, which is then input into the ECU for the following purposes: 1. Adjusting the fuel injection amount: Increases the fuel injection amount when the temperature is low. 2. Adjusting the ignition timing: Advances the ignition timing when the temperature is low, and retards it at high temperatures to prevent knocking. 3. Affecting the idle control valve: At low temperatures, the ECU controls the idle control valve based on the water temperature sensor signal to increase the engine speed. Water temperature sensors are divided into two main types. Regardless of the type, their internal structure consists of a thermistor with a resistance range between 275 ohms and 6500 ohms. The resistance increases as the temperature decreases and decreases as the temperature rises.
When it comes to the location of the coolant temperature sensor on the Grand Cherokee, I've always been quite interested in it because it directly affects engine performance. The sensor is typically installed near the engine cylinder head, specifically at the front of the engine close to the cooling system. For example, on my 2015 5.7L model, it's clipped between the intake manifold and the thermostat—just be careful when opening the hood to avoid touching hot components. If you're unsure about the exact location, you can first check the user manual or look for a model schematic online. Alternatively, use a flashlight to scan the top of the engine; you'll spot a small component with wires attached—that's the one. This sensor is actually quite important. If it's misplaced or faulty, the engine may overheat, trigger error codes, and fuel consumption can skyrocket. I often help friends inspect this part and recommend not forcing it, especially on older vehicles where wiring tends to degrade. It's best to have the right tools or consult someone knowledgeable for a proper check.
