why does my Ram 1500 DT (2019-Present) fan run continuously

Ram 1500 DT (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

510 words

Problem Statement

Learn how to diagnose and fix the cooling system fan running continuously in a 2019 Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Cooling System

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems
•Allow the engine to cool before opening the radiator or working on the cooling system

Symptoms

•Fan operates continuously even when the engine is off
•Engine overheating or running hot
•Check engine light illuminated
•Unusual engine noise from the fan
•Decreased fuel economy
•Air conditioning performance issues

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any diagnostic trouble codes (DTCs)
2
Inspect the coolant level and condition to ensure it is adequate and not contaminated
3
Check the engine temperature sensor for proper operation using a multimeter
4
Verify the operation of the thermostat by testing for proper opening and closing temperatures
5
Inspect the fan relay and fuse for any signs of damage or malfunction
6
Check wiring and connections to the cooling fan for shorts or corrosion

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Socket set
•Torque wrench
•Drain pan

Parts Required

•Engine coolant temperature sensor
•Thermostat
•Fan relay (if faulty)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any diagnostic trouble codes (DTCs)
2
Inspect the coolant level and condition to ensure it is adequate and not contaminated
3
Check the engine temperature sensor for proper operation using a multimeter
4
Verify the operation of the thermostat by testing for proper opening and closing temperatures
5
Inspect the fan relay and fuse for any signs of damage or malfunction
6
Check wiring and connections to the cooling fan for shorts or corrosion

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to prevent electrical shock.

2. Inspect and Replace the Engine Coolant Temperature Sensor

Remove any engine covers if necessary.
Locate the engine coolant temperature sensor.
Disconnect the electrical connector from the sensor.
Remove the sensor using a socket or wrench.
Install the new coolant temperature sensor and reconnect the wiring.
Reinstall any covers removed.

3. Test and Replace the Thermostat (if necessary)

Drain the coolant from the radiator using a drain pan.
Remove the thermostat housing by loosening the bolts.
Take out the thermostat and inspect it for proper operation (open and close).
Replace with a new thermostat if it appears faulty.
Reinstall the thermostat housing and refill the cooling system with new coolant.

4. Check and Replace Fan Relay (if necessary)

Locate the fan relay in the fuse box.
Remove the relay and test it for continuity using a multimeter.
Replace the relay if it fails the continuity test.
Reinstall the relay and ensure it is seated properly.