1999 Ford Expedition Heater Not Working [How To Fix]

Do you own a 1999 Ford Expedition and your heater isn’t working You’re not alone. This is a common problem that can be frustrating and inconvenient. But don’t worry, there is a fix! In this guide, I’ll walk you through the steps on how to troubleshoot and repair your 1999 Ford Expedition heater. So, if you’re ready to get your heater back up and running, let’s get started!

Why 1999 Ford Expedition Heater Not Working

No Heater Core

The heater core is a small radiator that transfers heat from the engine coolant to the air inside the vehicle. If the heater core is clogged or damaged, it will not be able to transfer heat to the air, and the heater will not work.

Thermostat

The thermostat controls the flow of coolant through the engine. If the thermostat is stuck open, coolant will flow through the engine and heater core all the time, even when the engine is not running. This will cause the heater to be hot all the time, even when you don’t want it to be. If the thermostat is stuck closed, coolant will not flow through the heater core, and the heater will not work.

Heater Control Valve

The heater control valve regulates the flow of coolant to the heater core. If the heater control valve is stuck open, coolant will flow through the heater core all the time, even when the heater is not turned on. This will cause the heater to be hot all the time, even when you don’t want it to be. If the heater control valve is stuck closed, coolant will not flow through the heater core, and the heater will not work.

Blend Door

The blend door controls the amount of air that flows through the heater core. If the blend door is stuck open, all of the air will flow through the heater core, and the heater will be hot all the time. If the blend door is stuck closed, no air will flow through the heater core, and the heater will not work.

Electrical Problems

The heater may not be working if there is a problem with the electrical system. This could be a problem with the blower motor, the heater control switch, or the wiring.

1999 Ford Expedition Heater Not Working

Symptoms of a 1999 Ford Expedition Heater Not Working

There are a few different symptoms that you may experience if your 1999 Ford Expedition heater is not working properly. These include:

The air coming out of the vents is cold or cool, even when the temperature is set to high.
The blower motor is not working, or it is making a loud noise.
The heater core is leaking, causing water to drip onto the passenger floorboard.
The blend door actuator is stuck, preventing the air from being directed to the passenger compartment.

How to Troubleshoot a 1999 Ford Expedition Heater Not Working

If your 1999 Ford Expedition heater is not working, you can troubleshoot the problem yourself by following these steps:

1. Check the fuses:
The first thing you should do is check the fuses for the heater blower motor and the heater core. These fuses are located in the under-hood fuse box. If either fuse is blown, replace it with a new fuse of the same amperage.

2. Check the blower motor:
If the blower motor is not working, you can test it by disconnecting the electrical connector and using a multimeter to check for continuity. If there is no continuity, the blower motor is bad and will need to be replaced.3. Check the heater core:
If the heater core is leaking, you will see water dripping onto the passenger floorboard. To test the heater core, you can use a pressure tester to check for leaks. If the heater core is leaking, it will need to be replaced.

4. Check the blend door actuator:
The blend door actuator controls the direction of the air coming out of the vents. If the blend door actuator is stuck, it will prevent the air from being directed to the passenger compartment. To test the blend door actuator, you can use a multimeter to check for continuity. If there is no continuity, the blend door actuator is bad and will need to be replaced.

How to Fix a 1999 Ford Expedition Heater Not Working

Once you have diagnosed the problem with your 1999 Ford Expedition heater, you can fix it by following these steps:

1. Replace the blown fuse:
If the blower motor fuse is blown, simply replace it with a new fuse of the same amperage.

2. Replace the blower motor:
If the blower motor is bad, you can replace it with a new blower motor.3. Replace the heater core:
If the heater core is leaking, you can replace it with a new heater core.

4. Replace the blend door actuator:
If the blend door actuator is stuck, you can replace it with a new blend door actuator.

Preventing a 1999 Ford Expedition Heater from Not Working

There are a few things you can do to prevent your 1999 Ford Expedition heater from not working:

Keep the cabin air filter clean:
A dirty cabin air filter can restrict airflow to the heater core, which can cause the heater to not work properly.

Avoid running the heater on high for extended periods of time:
Running the heater on high for extended periods of time can damage the heater core.

Have your heater system serviced regularly:
Having your heater system serviced regularly can help to identify and fix any problems before they cause the heater to stop working.

By following these tips, you can help to keep your 1999 Ford Expedition heater working properly for many years to come.

Also Read: 1999 Ford Expedition Odometer Not Working

FAQs: 1999 Ford Expedition Heater Not Working

Why is my 1999 Ford Expedition heater not working?

There are a few possible reasons why your 1999 Ford Expedition heater may not be working. Here are some of the most common causes:

A faulty thermostat: The thermostat is responsible for regulating the temperature of the coolant in your engine. If the thermostat is stuck open or closed, it can prevent the heater from working properly.

A faulty water pump: The water pump circulates coolant through the engine and heater core. If the water pump is not working properly, it can cause the heater to become cold.

A clogged heater core: The heater core is a radiator that transfers heat from the coolant to the air inside the cabin. If the heater core is clogged, it can prevent the air from being heated properly.

A faulty blend door actuator: The blend door actuator controls the position of the blend door, which directs air from the heater core to the passenger compartment. If the blend door actuator is not working properly, it can prevent the air from being directed to the passenger compartment.

A faulty blower motor: The blower motor blows air through the heater core and into the passenger compartment. If the blower motor is not working properly, it can prevent the air from being heated and circulated.

How do I fix my 1999 Ford Expedition heater?

The specific steps you need to take to fix your 1999 Ford Expedition heater will depend on the cause of the problem. However, here are some general steps that may help:

1. Check the thermostat: The thermostat is located in the engine block. To check the thermostat, you will need to remove the thermostat housing and visually inspect the thermostat. If the thermostat is stuck open or closed, it will need to be replaced.
2. Check the water pump: The water pump is located at the front of the engine. To check the water pump, you will need to remove the serpentine belt and visually inspect the water pump. If the water pump is not working properly, it will need to be replaced.
3. Check the heater core: The heater core is located in the passenger compartment, under the dashboard. To check the heater core, you will need to remove the heater core cover and visually inspect the heater core. If the heater core is clogged, it will need to be cleaned or replaced.
4. Check the blend door actuator: The blend door actuator is located behind the dashboard. To check the blend door actuator, you will need to remove the dashboard and visually inspect the blend door actuator. If the blend door actuator is not working properly, it will need to be replaced.
5. Check the blower motor: The blower motor is located under the hood, near the firewall. To check the blower motor, you will need to remove the blower motor housing and visually inspect the blower motor. If the blower motor is not working properly, it will need to be replaced.

What are the symptoms of a 1999 Ford Expedition heater not working?

The symptoms of a 1999 Ford Expedition heater not working can include:

The heater does not blow hot air.
The heater blows cold air.
The heater blows air that is only warm at certain temperatures.
The heater makes a loud noise when it is turned on.
The heater smells like burning plastic or rubber.

What are the risks of driving a 1999 Ford Expedition with a heater that is not working?

There are a few risks associated with driving a 1999 Ford Expedition with a heater that is not working. These risks include:

Increased risk of hypothermia: If the heater is not working, you may be more likely to experience hypothermia, which is a condition that occurs when your body temperature drops below 95 degrees Fahrenheit. Hypothermia can be fatal if not treated promptly.
Increased risk of frostbite: If the heater is not working, you may be more likely to experience frostbite, which is a condition that occurs when your skin freezes. Frostbite can cause permanent damage to your skin and nerves.
Increased risk of accidents: If you are not able to keep warm while driving, you may be more likely to be involved in an accident.

How can I prevent my 1999 Ford Expedition heater from not working?

There are a few things you can do to prevent your 1999 Ford Expedition heater from not working. These include:

Keep your coolant levels topped off: The coolant in your