my Ford Explorer Fifth Generation (2011-2019) blower motor only works on high speed, what's wrong

Ford Explorer Fifth Generation (2011-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

486 words

Problem Statement

Learn how to diagnose and fix the blower motor issue in Ford Explorer (2011-2019) that only works on high speed. Step-by-step guide included.

Affected Component

HVAC

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components to prevent shocks or shorts.

Symptoms

•Blower motor functions only on high speed
•No airflow at lower speed settings
•Potential increase in cabin noise at high speed
•Possible intermittent operation of the blower motor
•No dashboard warning lights related to HVAC system

Diagnostic Steps

1
Inspect the blower motor switch for proper function.
2
Use an OBD-II scanner to check for any HVAC-related error codes.
3
Remove the blower motor resistor and visually inspect for damage or corrosion.
4
Test the blower motor resistor with a multimeter for continuity and resistance values.
5
Check the wiring harness and connectors for any signs of wear or damage.
6
Verify the blower motor itself is functioning correctly by applying direct voltage to it.

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

•Screwdriver set
•Multimeter
•Safety goggles
•Gloves

Parts Required

•Blower motor resistor (if faulty)

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Diagnostic Steps

1
Inspect the blower motor switch for proper function.
2
Use an OBD-II scanner to check for any HVAC-related error codes.
3
Remove the blower motor resistor and visually inspect for damage or corrosion.
4
Test the blower motor resistor with a multimeter for continuity and resistance values.
5
Check the wiring harness and connectors for any signs of wear or damage.
6
Verify the blower motor itself is functioning correctly by applying direct voltage to it.

Solution

1. Preparation

Tools Required: Screwdriver set, multimeter, safety goggles, gloves
Disconnect the vehicle battery to prevent electrical shorts during repair.

2. Remove the Blower Motor Resistor

Locate the blower motor resistor, typically found near the blower motor under the dashboard on the passenger side.
Remove any necessary panels or covers to access the resistor.
Disconnect the electrical connector from the resistor.
Unscrew the resistor from its mounting location and carefully remove it.

3. Inspect and Test the Resistor

Visually inspect the resistor for any signs of burning or damage.
Use a multimeter to check the resistance across the terminals of the resistor; refer to the vehicle’s service manual for specific resistance values.
If the readings are outside the specified range, replace the resistor.

4. Replace the Resistor (if necessary)

If replacement is needed, install the new blower motor resistor in reverse order of removal.
Ensure the screws are tightened to the manufacturer’s specifications (typically 4-6 Nm).

5. Reconnect and Test

Reconnect the electrical connector to the blower motor resistor.
Reconnect the vehicle battery.
Start the vehicle and test the blower motor at all speed settings to confirm proper operation.