how to fix Ford Explorer Fifth Generation (2011-2019) heater that only blows cold air?

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

612 words

Problem Statement

Learn how to diagnose and fix cold air blowing from the heater in Ford Explorer (2011-2019). Step-by-step guide with tools and procedures.

Affected Component

HVAC

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Allow engine to cool completely before working on the cooling system.
•Disconnect the battery before working on electrical components.

Symptoms

•Heater blows cold air regardless of temperature settings
•Engine temperature gauge is low or fluctuates
•Coolant leaks under the vehicle
•No heat from the dashboard vents
•Strange noises from the heater core area

Diagnostic Steps

1
Check Coolant Level: Inspect the coolant reservoir for proper coolant levels; refill if low.
2
Inspect for Coolant Leaks: Look for any visible leaks around hoses, the radiator, and the heater core.
3
Scan for Error Codes: Use an OBD-II scanner to check for any diagnostic trouble codes related to the HVAC system.
4
Test Thermostat: Check if the thermostat is stuck open by feeling the upper radiator hose after the engine reaches operating temperature.
5
Inspect Heater Core: Feel the inlet and outlet hoses of the heater core for temperature differences; both should be hot if the core is functioning.
6
Check Blend Door Operation: Verify that the blend door actuator is functioning properly by listening for movement when adjusting temperature settings.

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

•Socket set
•Screwdriver set
•OBD-II scanner
•Multimeter
•Coolant
•Funnel
•Shop towels
•Garden hose

Parts Required

•Thermostat
•Blend door actuator (if needed)
•Coolant

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Diagnostic Steps

1
Check Coolant Level: Inspect the coolant reservoir for proper coolant levels; refill if low.
2
Inspect for Coolant Leaks: Look for any visible leaks around hoses, the radiator, and the heater core.
3
Scan for Error Codes: Use an OBD-II scanner to check for any diagnostic trouble codes related to the HVAC system.
4
Test Thermostat: Check if the thermostat is stuck open by feeling the upper radiator hose after the engine reaches operating temperature.
5
Inspect Heater Core: Feel the inlet and outlet hoses of the heater core for temperature differences; both should be hot if the core is functioning.
6
Check Blend Door Operation: Verify that the blend door actuator is functioning properly by listening for movement when adjusting temperature settings.

Solution

1. Preparation

Tools Required: Socket set, screwdriver set, OBD-II scanner, multimeter, coolant, funnel, shop towels
Ensure the vehicle is parked on a level surface and the engine is cool before starting work.

2. Address Coolant Issues

Top Off Coolant: If coolant level is low, add the appropriate coolant mixture (50/50 ethylene glycol and distilled water) to the reservoir.
Inspect Hoses: Check all hoses for wear, cracks, or leaks; replace any damaged hoses.

3. Replace Thermostat (if faulty)

Drain Coolant: Place a drain pan under the radiator and drain the coolant.
Remove Thermostat:
- Disconnect the battery.
- Remove the upper radiator hose from the thermostat housing.
- Unbolt the thermostat housing and remove the old thermostat.
Install New Thermostat:
- Place a new thermostat in the housing, ensuring it is oriented correctly.
- Reinstall the housing and tighten bolts to manufacturer specifications (typically around 15-20 ft-lbs).
Reconnect Hose: Reattach the upper radiator hose securely.

4. Flush Heater Core (if clogged)

Disconnect Heater Hoses: Remove the inlet and outlet hoses from the heater core.
Flush with Water: Use a garden hose to flush water through the heater core until the water runs clear.
Reconnect Hoses: Reattach the hoses securely.

5. Replace Blend Door Actuator (if malfunctioning)

Access Actuator: Remove the dashboard panel or glove box to access the blend door actuator.
Remove Old Actuator: Unplug the electrical connector and remove the actuator screws.
Install New Actuator: Position the new actuator and secure it with screws. Reconnect the electrical connector.