2003 Ford Expedition Rear Heat Not Working [Easy Steps]

The 2003 Ford Expedition is a popular SUV that is known for its comfort and reliability. However, one common problem that can occur with these vehicles is that the rear heat stops working. This can be a major inconvenience, especially during the winter months.

In this guide, we will walk you through the steps to troubleshoot the problem of a . We will provide you with the information you need to identify the cause of the problem and fix it yourself.

We understand that this issue can be frustrating, so we will do our best to make the troubleshooting process as easy as possible. By the end of this guide, you will be able to get your rear heat working again so that you can stay warm and comfortable on your next road trip.

Why 2003 Ford Expedition Rear Heat Not Working

Bad blower motor resistor

The blower motor resistor controls the speed of the blower motor. If the resistor is bad, it can cause the rear heat to not work. To check the resistor, you can use a multimeter to measure the resistance between the terminals. If the resistance is infinite, the resistor is bad and needs to be replaced.

Bad blower motor

The blower motor is responsible for blowing air through the vents. If the blower motor is bad, it can cause the rear heat to not work. To check the blower motor, you can use a multimeter to measure the voltage at the motor terminals. If there is no voltage, the motor is bad and needs to be replaced.

Bad blend door actuator

The blend door actuator controls the position of the blend door, which directs air to the front or rear vents. If the blend door actuator is bad, it can cause the rear heat to not work. To check the blend door actuator, you can use a multimeter to measure the voltage at the actuator terminals. If there is no voltage, the actuator is bad and needs to be replaced.

Blocked air duct

An air duct can become blocked with dirt, dust, or debris, which can prevent air from flowing to the rear vents. To check for a blocked air duct, you can remove the air filter and look inside the duct. If you see any obstructions, you can clear them out with a vacuum cleaner.

How to Troubleshoot: 2003 Ford Expedition Rear Heat Not Working

Symptoms

There are a few different symptoms that you may experience if the rear heat in your 2003 Ford Expedition is not working. These include:

The rear vents are not blowing hot air.
The rear defroster is not working.
The rear window is not defrosting.
The rear seat passengers are complaining about being cold.

Causes

There are a number of different things that could cause the rear heat in your 2003 Ford Expedition to not work. These include:

A blown fuse.
A faulty thermostat.
A faulty blend door actuator.
A faulty heater core.
A clogged heater core.
A restricted air flow.

Diagnosis

The first step in diagnosing the problem with your 2003 Ford Expedition’s rear heat is to check the fuses. The fuses for the rear heat are located in the under-hood fuse box. There are two fuses that you need to check: the rear heat fuse and the blower motor fuse.

To check the fuses, use a voltmeter to test for continuity. If the fuse is blown, it will have no continuity. If the fuse is not blown, you can move on to the next step.

The next step is to check the thermostat. The thermostat is located in the engine block. To check the thermostat, you will need to remove the thermostat housing. Once the housing is removed, you can use a thermometer to check the temperature of the coolant. The coolant should be between 195 and 220 degrees Fahrenheit. If the coolant is not at the correct temperature, the thermostat is faulty and will need to be replaced.

The next step is to check the blend door actuator. The blend door actuator is located in the heater core housing. To check the blend door actuator, you will need to remove the heater core housing. Once the housing is removed, you can use a multimeter to test for continuity. If the blend door actuator is faulty, it will have no continuity. If the blend door actuator is not faulty, you can move on to the next step.

The next step is to check the heater core. The heater core is located in the firewall. To check the heater core, you will need to remove the heater core housing. Once the housing is removed, you can use a pressure tester to test the heater core. The heater core should hold pressure for at least 20 minutes. If the heater core does not hold pressure, it is faulty and will need to be replaced.

The next step is to check for a clogged heater core. To check for a clogged heater core, you will need to remove the heater core housing. Once the housing is removed, you can use a shop vac to clean out the heater core. If the heater core is clogged, it will need to be cleaned or replaced.

The final step is to check for a restricted air flow. To check for a restricted air flow, you will need to remove the air ducts. Once the air ducts are removed, you can use a flashlight to inspect the air flow. If the air flow is restricted, you will need to clean or replace the air ducts.

Repair

Once you have diagnosed the problem with your 2003 Ford Expedition’s rear heat, you can begin the repair process. The repair process will vary depending on the cause of the problem.

If the problem is a blown fuse, you can simply replace the fuse. If the problem is a faulty thermostat, you will need to replace the thermostat. If the problem is a faulty blend door actuator, you will need to replace the blend door actuator. If the problem is a faulty heater core, you will need to replace the heater core. If the problem is a clogged heater core, you will need to clean or replace the heater core. If the problem is a restricted air flow, you will need to clean or replace the air ducts.

Conclusion

If you are having trouble with the rear heat in your 2003 Ford Expedition, it is important to have the problem diagnosed and repaired as soon as possible. A malfunctioning rear heat can make it difficult to keep your passengers warm, which can be dangerous in cold weather.

Also Read: 2003 Ford Expedition Rear Heater Not Working

FAQs: 2003 Ford Expedition Rear Heat Not Working

Why is the rear heat not working on my 2003 Ford Expedition?

There are a few possible reasons why the rear heat may not be working on your 2003 Ford Expedition. Here are some of the most common causes:

The blend door actuator is stuck: The blend door actuator is responsible for controlling the airflow between the front and rear vents. If the actuator is stuck, it may not be able to properly direct the air to the rear vents, resulting in no heat.

The rear heater core is clogged: The rear heater core is a small radiator that heats the air that is sent to the rear vents. If the heater core is clogged, it will not be able to effectively heat the air, resulting in no heat.

The rear heater hoses are leaking: The rear heater hoses carry hot coolant from the engine to the heater core. If the hoses are leaking, coolant will leak out and the heater core will not be able to heat the air properly.

The rear heater control valve is stuck: The rear heater control valve is responsible for regulating the flow of coolant to the heater core. If the valve is stuck, it may not be able to properly control the flow of coolant, resulting in no heat.

How do I fix the rear heat on my 2003 Ford Expedition?

To fix the rear heat on your 2003 Ford Expedition, you will need to identify the cause of the problem and then take the appropriate steps to fix it. Here are the steps to troubleshoot and fix the rear heat on your 2003 Ford Expedition:

1. Check the blend door actuator: The blend door actuator is located under the dash on the passenger side. To check the actuator, turn on the heat and feel the air coming out of the rear vents. If the air is not hot, then the actuator may be stuck. To fix the actuator, you will need to remove the actuator and then lubricate it with a silicone spray.
2. Check the rear heater core: The rear heater core is located in the back of the vehicle, behind the rear seats. To check the heater core, you will need to remove the rear seats and then access the heater core. If the heater core is clogged, you will need to remove it and then clean it with a descaling solution.
3. Check the rear heater hoses: The rear heater hoses are located under the vehicle. To check the hoses, you will need to remove the underbody cover. If the hoses are leaking, you will need to replace them.
4. Check the rear heater control valve: The rear heater control valve is located under the dash on the passenger side. To check the valve, you will need to remove the valve and then check the valve stem. If the valve stem is stuck, you will need to replace the valve.

What are the symptoms of a bad rear heater on a 2003 Ford Expedition?

The symptoms of a bad rear heater on a 2003 Ford Expedition may include:

No heat coming out of the rear vents
Warm air coming out of the rear vents, even when the heat is turned on
The temperature of the air coming out of the rear vents is not consistent
The rear vents are blowing cold air, even when the heat is turned on

How much does it cost to fix a rear heater on a 2003 Ford Expedition?

The cost of fixing a rear heater on a 2003 Ford Expedition will vary depending on the cause of the problem. The average cost to fix a rear heater is between $100 and $300. However, the cost could be higher if the problem is more serious, such as a clogged heater core or a broken blend door actuator.

Can I drive my 2003 Ford Expedition without rear heat?

Yes, you can drive your 2003 Ford Expedition without rear heat. However, it is important to note that driving without rear heat can be dangerous in cold weather, as the rear passengers may not be able to stay warm. If you are driving in cold weather, it is best to have the rear heat working so that all of the passengers can stay warm.