why is my Honda CR-V Fifth Generation (2017-2022) temperature gauge fluctuating

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Coolant Level Check

• Open the hood and locate the coolant reservoir.
• Check the coolant level; if low, top up with the manufacturer-recommended coolant mixture.
• Inspect for any visible leaks around hoses and the radiator.

3. Thermostat Replacement

• Drain the coolant from the radiator using a drain pan.
• Remove the thermostat housing by unscrewing the bolts (torque specifications: 15-20 ft-lbs).
• Replace the old thermostat with a new one, ensuring proper orientation.
• Reinstall the thermostat housing and torque the bolts to specifications.

4. Coolant Temperature Sensor Inspection

• Locate the coolant temperature sensor (usually near the thermostat).
• Disconnect the sensor's electrical connector.
• Using a multimeter, measure the resistance of the sensor (consult the service manual for specific values).
• If the sensor is out of range, replace it with a new one.

5. Radiator and Hose Inspection

• Inspect the radiator for any external damage or blockages.
• Check all hoses for cracks, leaks, or soft spots; replace any damaged hoses.
• Ensure the radiator cap is functioning properly by replacing it if it shows signs of wear.