Skip the auto shop - Our mechanics make house calls

5 Essential Things to Know About the Defrosting System in Your Car

Car Defrosting System

When you are driving in the colder months of the year, one of the most important systems in your vehicle is your defroster. When you turn on the defroster, it clears the windows, which can help to increase your visibility. If the defroster has an issue, then it could create dangerous driving conditions.

How Does the System Work?

The defroster will take air and push it through the heater core and then dry the air. It blows onto your windows through the vents. The dry air will help to evaporate the moisture on the window and the hot air will melt any ice or snow that may have formed.

How Does the Rear Defroster Work?

While the defroster in the front uses forced air to provide a clear view for drivers, the rear defroster uses an electrical system. The lines on the back window are actually electrical wires. Electrical current will flow through the wires, which helps to remove the condensation that forms on the window.

Are the Wires in the Rear Defroster Dangerous?

They have only a small amount of electrical current running through them, and they do not get very warm. They are entirely safe.

What Causes Problems With the Front Defroster?

When the defroster is not working properly, it could stem from a number of different things. Some of the most common problems include buttons that stick or that no longer works properly, problems with the vents, and not enough antifreeze in the vehicle. In addition, there could be something that is blocking the fresh air intake. The thermostat might be malfunctioning, or the heater core could be bad. You may also have a bad blower that is not pushing enough air into the vehicle.

What Causes Problems With the Rear Defroster?

The rear defroster might have trouble working for a number of different reasons as well. It might have broken tabs that connect the circuit to the defroster, or there could be a broken grid that has damaged some of the wires. In addition, as the system gets older, it may stop working as well as it once did.

If you have issues with your car’s defroster, or any other problems with your vehicle, you need to take it to a good mechanic to have it checked out.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...


Related questions

Q: How do I defrost the windows?

The Defrost helps you defog your windshield by using heated air from the heater onto the windshield. To turn the Defrost on: Press the Defrost button located on the climate control panel. Press the Rear Defroster/Heated Mirrors button and...

Q: Wrong antifreeze and fuel additive used and the car is noisy and runs roughly

This vehicle should not be run any at all until it can be diagnosed and repaired. In cases where coolant has been put into the engine, this can damage various engine components such as the bearings, pistons and crankshaft....

Q: AC air coming out defrost channel

This is an indication that the mode door actuator within your dash has gone bad. This actuator is responsible for moving the door that allows or blocks off air flow to a certain vent location. Sometimes this part can be...