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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

AC and defrost sticking
Hello. I am not sure what you mean by the AC and defrost seem to be sticking when engaging. If the direction of the vents is not changing then one of the door actuators may be failing. If the air...
Cars stalls when the AC is turned on.
A seized AC compressor can stall your engine when you turn on the air or defroster because it sends a signal to engage the clutch on the compressor, which causes more resistance than normal. But there are switches that level...
Defroster not working
Hi, the problem could be the defroster grid has separated from the main power clip/tab. To reattach the tabs, remove the metal clip out of the connectors and use a tab repair kit to repair the problem. Replace the separated...
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...
Car stalling when turning on the AC.
A stalling vehicle when the AC or Defroster is activate indicates a problem with the compressor. It is either seized/hard to rotate or the AC refrigerant is overcharged preventing the compressor from turning. This will also put increased load on...
Car overheating and not defrosting properly.
Hi, I have seen this issue quite often on the PT Cruiser. This is typically caused by a failure in the heater core that is located in the dash. This part carries hot coolant into the interior of the car...
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...
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. ...
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...
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...
Air control knob staying in one position
There is a possibility that the mode door for the vent, floor, defrost blend door is broken in the evaporator case, or that something fell into the case through the defroster duct and is binding the door. The dash panel...
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...
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...
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,...
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...
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.
Car overheating during idling or stop and go traffic
Hello. If the engine will stay cool with the AC on or when the vehicle is moving then there is a cooling fan circuit issue. The computer may not be turning on the fan when the engine is getting hot....
Ac & heat only blow out of defroster when I turn the
It sounds like you have a problem with the vacuum supply to the HVAC control head. Engine vacuum is what changes the airflow to the vents and floor. Defrost is the default position when there is not a vacuum source....
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...
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...

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