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Defrosters

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How the Defroster Works
A vehicle defroster is a valuable component for your car, especially on those cold winter days when you have frost or ice on your windshield. While older models only have defrosters on the front...
Do Wipers Work Better With the Defroster On?
It seems that sometimes when you’re driving in cool, wet weather, it’s hard to keep your windshield from fogging up. The wiper blades wipe the windshield but they leave streaks. The...
How Long Does a Rear Window Defogger Switch Last?
Your car’s cabin protects you and your passengers from the elements, harsh sunlight, wind and more. However, having an enclosed cabin can lead to visibility problems when the air is...
5 Essential Things to Know About the Defrosting System in Your Car
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,...
Symptoms of a Bad or Failing Rear Window Defogger Switch
If the rear window won't clear, the rear window defogger button won't light up, or the defogger isn't working consistently, have the switch replaced.
What Does the Defrost Indicator (Front and Rear) Warning Light Mean?
When the defrost indicator warning light is on, the defroster is on and functioning. If it's flashing, an issue has been detected with the system.

Related questions

Question
Noise when i turn heater on for while to defrost or vents. 2003 Chevy Impala
Hi there, thanks for writing in about your 2003 Chevrolet Impala. The noise you may be hearing is the blend door actuator clicking until the door gets into the position it needs to be in. When these actuators go bad...
Question
Defroster malfunctioning
Your car has a dual temperature control system. If you put both sides to full cold or full hot, then it will not be in automatic mode and should be blow fully cold or hot out of the vents. ...
Question
Push button does not light up. All fuses are good good.
In addition to the fuse, there is also a relay for the rear defroster to make sure it is working properly (swap the front defroster relay for the rear one if the front is working properly as a check). If...
Question
A/C stuck on floor and defrost will not change on any settings
Hello. You need to see if the mode door actuator is working. This actuator is on the evaporator case on the driver's side above the gas pedal. You have to remove the knee bolster for access. If this is the...
Question
AC Blowing from vents and defrost
The air conditioner blend door is controlled by an electronic actuator and if the door is not in set position then you may have a defective actuator and need to replace it. The door operation should be in the manual...
Question
No heat coming out when heater or defroster is turned on
Hello there, a variety of faults will cause your 2011 Chevrolet Silverado 1500 heat to not work with the defroster. If the heat works from other vent settings than it is likely an AC blend door motor is faulty. If...
Question
When you turn on the defroster/defogger, is the windshield supposed to defog instantly?
This can actually take a few minutes - and depends on the temperature and level of moisture in the air inside as well as outside the vehicle. Two things happen when you use "Defrost/Defog". The air needs to be heated,...
Question
My console is not working can't turn on my air or radio.. Can't defrost
Hello. I would start by load testing the battery and the alternator. Most of the time when this happens all of a sudden it is because there is a loss of voltage in the electrical system. If that is fine...
Question
Window tint bubbling in rear window will I mess up defrost or antenna remove ingredients it
No, the defrosting mechanism is built into the window and should not be destroyed by removing the tint. As with anything, however, just use caution when taking the tint off.
Question
The heater, radio and rear defroster stopped working. Check all fuses and they were fine. what else could it be?
If all of these issues began at the same time, it is possible that you have a bad ignition switch. Heat, Air Conditioning and I believe the radio are only powered with the key in the ON position. They will...
Question
Defrost button wont come on. Control power button doesnt work.
It seems like the defrost of the vehicle has an issue. There are several possibilities that could cause this. The control unit for the climate control system could be malfunctioning. The fuse for the rear defrost could be blown due...
Question
How defroster works when there is no ac
The normal operation of the defroster is for the outside air is drawn into the a/c heater inlet with the system in the defrost position. When the system is in the defrost position the a/c compressor comes on and the...
Question
No heat,defrost or air coming from front a/c vents
Hello - there a couple of possibilities here for this problem: the blower motor resistor pack, or the fan switch portion of the HVAC control itself. The blower motor resistor pack regulates fan speed in the Low or Medium positions,...
Question
Check Engine Light is on - 2003 Honda Accord
Hello. If the issues appeared when using the AC and defroster, then they are likely related to that system. In most cases, the AC / Heater does not use vacuum lines as a part of it's operation, so a vacuum...
Question
AC will only blow air on defrost and not on vent.
Hello, on this particular model of vehicle they have whats called a blend door actuator in the HVAC unit under the dash. If it doesn't switch from defrost to front air, this is probably your issue. This repair is very...
Question
How do I know if the rear defrost module is bad?
Hi there. If you checked the fuse, defroster switch, main power tabs and the wiring but the defroster still does not work, then It is time to take a look at the relay. The defroster relay is normally located under...
Question
Fan wont blow out top vents for defrost.
Hi there. Check the blend doors to the vents and see if they move when the switch is turned. If they do not move, then check for a vacuum hose to the blend door actuator. If there is no vacuum...
Question
The air conditioning, heater, and defroster are not working.
The symptoms you are experiencing can be caused by a few different things. If you are hearing a gurgling noise and your heater is not providing heat, then I would check the engine's coolant. If the coolant is low, it...
Question
why does the heated side mirror drivers side not work
Hi. There are a couple of reasons why your driver's side heated mirror is not working. The first thing that comes to mind is the fuse for the heated mirror has blown and is causing it not to work. Another...
Question
My AC is only blowing through the defrost vent and rear defrost doesn't work.
Hi there. The blend doors on your vehicle are operated by a vacuum hose. Check the vacuum lines to the engine and see if any of them are broken, has a hole, or is disconnected. Check the vacuum hose on...

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