1999 Ford Expedition Heat Not Working [Easy Fixes!]

Do you own a 1999 Ford Expedition and your heat isn’t working You’re not alone. This is a common problem with these vehicles, and it can be a real pain. But don’t worry, I’m here to help. In this guide, I’ll walk you through the steps to troubleshoot the problem and get your heat back up and running. So whether you’re a DIYer or you’re taking your truck to a mechanic, this guide will help you get the job done.

Why 1999 Ford Expedition Heat Not Working

Thermostat

The thermostat is a valve that controls the flow of coolant through the engine. If the thermostat is stuck open, coolant will flow through the radiator instead of the heater core, and the cabin will not heat up.

Heater Core

The heater core is a small radiator that transfers heat from the engine coolant to the air that flows through the cabin. If the heater core is clogged or damaged, it will not be able to transfer heat efficiently, and the cabin will not heat up.

Heating Controls

The heating controls on a vehicle can malfunction, causing the cabin to not heat up. The controls may be stuck in the off position, or they may not be sending the correct signal to the heater.

Electrical Problems

Electrical problems can also cause the cabin to not heat up. A faulty blower motor, a bad ground, or a loose connection can all prevent the heater from working properly.

How to Troubleshoot: 1999 Ford Expedition Heat Not Working

The 1999 Ford Expedition is a popular SUV that is known for its reliability and durability. However, like any other vehicle, it is not immune to problems. One common issue that can occur is when the heat stops working. This can be a frustrating problem, especially during the winter months. However, it is usually a relatively simple fix.

Symptoms

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

The heat does not come on at all
The heat only blows cold air
The heat blows hot air but only for a short period of time
The heat blows hot air but is not as hot as it used to be

Causes

There are a number of different things that can cause the heat in your 1999 Ford Expedition to stop working. These include:

A blown fuse
A faulty thermostat
A clogged heater core
A faulty radiator cap
A faulty water pump
A restricted coolant flow

Diagnosis

The first step in troubleshooting the problem is to identify the cause. This can be done by following these steps:

1. Check the fuses. The first thing you should do is check the fuses to make sure that they are not blown. The fuses for the heater are located in the under-hood fuse box.
2. Check the thermostat. The thermostat is a valve that regulates the flow of coolant through the engine. If the thermostat is stuck open, coolant will not flow through the heater core and the heat will not work. To check the thermostat, you will need to remove it from the engine and test it with a thermometer.
3. Check the heater core. The heater core is a radiator that is located inside the passenger compartment. It is responsible for heating the air that blows through the vents. If the heater core is clogged, it will not be able to heat the air properly. To check the heater core, you will need to remove it from the vehicle and flush it with water.
4. Check the radiator cap. The radiator cap is responsible for maintaining the pressure in the cooling system. If the radiator cap is faulty, it can allow coolant to leak out of the system and the heat will not work. To check the radiator cap, you will need to remove it from the radiator and inspect it for damage.
5. Check the water pump. The water pump is responsible for circulating coolant through the engine. If the water pump is faulty, it will not be able to circulate coolant through the heater core and the heat will not work. To check the water pump, you will need to remove it from the engine and inspect it for damage.
6. Check for restricted coolant flow. If there is a restriction in the coolant flow, it will prevent coolant from reaching the heater core and the heat will not work. To check for restricted coolant flow, you will need to inspect the coolant hoses and the radiator for leaks or blockages.

Repair

Once you have identified the cause of the problem, you can begin to repair it. The following are the steps involved in repairing the heat in your 1999 Ford Expedition:

1. Replace the blown fuse. If a fuse is blown, simply replace it with a new one.
2. Replace the thermostat. If the thermostat is stuck open, it will need to be replaced. To replace the thermostat, you will need to drain the coolant from the engine and remove the thermostat housing. Once the thermostat housing is removed, you can remove the thermostat and install a new one.
3. Flush the heater core. If the heater core is clogged, it will need to be flushed. To flush the heater core, you will need to remove it from the vehicle and connect it to a garden hose. Once the heater core is connected to the garden hose, you can turn on the water and flush the core until the water runs clear.
4. Replace the radiator cap. If the radiator cap is faulty, it will need to be replaced. To replace the radiator cap, you will need to remove the old cap and install a new one.
5. Replace the water pump. If the water pump is faulty, it will need to be replaced. To replace the water pump, you will need to remove the old pump and install a new one.
6. Repair or replace the restricted coolant flow. If there is a restriction in the coolant flow, it will need to be repaired or replaced. To repair or replace the restricted coolant flow, you will need to inspect the

Also Read: 1999 Ford Expedition Heater Not Working

FAQs: 1999 Ford Expedition Heat Not Working

What could be the cause of my 1999 Ford Expedition’s heat not working?

There are a few possible causes for your 1999 Ford Expedition’s heat not working. These include:

A faulty thermostat
A clogged heater core
A bad blower motor
A faulty blend door actuator
A lack of coolant

How can I check the thermostat to see if it’s the cause of the problem?

To check the thermostat, you will need to:

1. Locate the thermostat housing. It is typically located on the passenger side of the engine block.
2. Remove the thermostat housing cover.
3. Remove the thermostat.
4. Immerse the thermostat in a pot of water and heat it until it opens.
5. If the thermostat does not open, it is faulty and will need to be replaced.

How can I check the heater core to see if it’s the cause of the problem?

To check the heater core, you will need to:

1. Locate the heater core. It is typically located under the dashboard.
2. Remove the heater core cover.
3. Inspect the heater core for leaks.
4. If you see any leaks, the heater core is faulty and will need to be replaced.

How can I check the blower motor to see if it’s the cause of the problem?

To check the blower motor, you will need to:

1. Locate the blower motor. It is typically located under the dash.
2. Remove the blower motor cover.
3. Inspect the blower motor for damage.
4. If you see any damage, the blower motor is faulty and will need to be replaced.

How can I check the blend door actuator to see if it’s the cause of the problem?

To check the blend door actuator, you will need to:

1. Locate the blend door actuator. It is typically located under the dash.
2. Remove the blend door actuator cover.
3. Inspect the blend door actuator for damage.
4. If you see any damage, the blend door actuator is faulty and will need to be replaced.

How can I add coolant to my 1999 Ford Expedition?

To add coolant to your 1999 Ford Expedition, you will need to:

1. Locate the coolant reservoir. It is typically located on the passenger side of the engine block.
2. Remove the coolant reservoir cap.
3. Add coolant to the reservoir until it reaches the full mark.
4. Replace the coolant reservoir cap.

How can I fix my 1999 Ford Expedition’s heat not working?

Once you have determined the cause of the problem, you can fix your 1999 Ford Expedition’s heat not working by:

Replacing the faulty thermostat.
Replacing the clogged heater core.
Replacing the bad blower motor.
Replacing the faulty blend door actuator.
Adding coolant to the reservoir.