my Ram 1500 DT (2019-Present) shows high temperature but coolant is full, why?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool completely before proceeding.

2. Inspect and Replace the Coolant Temperature Sensor

• Locate the coolant temperature sensor on the engine block.
• Disconnect the electrical connector from the sensor.
• Remove the sensor using a socket or wrench.
• Install the new coolant temperature sensor and reconnect the electrical connector.

3. Check and Replace the Thermostat

• Drain the coolant from the system into a container.
• Remove the upper radiator hose from the thermostat housing.
• Unbolt the thermostat housing to access the thermostat.
• Replace the old thermostat with a new one, ensuring the correct orientation.
• Reassemble the thermostat housing and reattach the upper radiator hose.
• Refill the cooling system with the appropriate coolant.

4. Inspect and Replace the Radiator Fan

• Check the operation of the radiator fan by turning on the engine and observing if it activates as the engine heats up.
• If inoperative, disconnect the fan from the electrical connector and remove it from its mounting.
• Install a new radiator fan and reconnect the electrical connector.

5. Check and Replace the Water Pump (if necessary)

• Drain any remaining coolant from the system.
• Remove the serpentine belt from the water pump pulley.
• Unbolt the water pump from the engine block and detach it.
• Clean the mounting surface and install the new water pump.
• Reattach the serpentine belt and refill the cooling system with coolant.