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Defrosters

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How the Defroster Works
The car defroster is a component that is commonly used. Front defrosters usually use air current, while rear defrosters are electric.
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
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
When air comes into vehicle so I can have the defroster on - it sucks exhaust fumes from other vehicles to inside my car.
Hi there. All vehicles are set up to take the air from outside and have the air conditioning on to make the defroster work. There is nothing you can do to change the defrost settings.
Question
How to defrost 1999 Honda Civic's front and side windows. front takes so long to melt
Hi there. the way the defroster works is the is heater on and the air conditioning is on to dry the air on the windows. The air conditioner compressor cycling on and off frequently is normal. Check the defroster vents...
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
I am having issues with the defroster blowing cold air on the driver side
Hi there. There is a blend door issue on your ducting to your heating and air conditioning system. Check all of the blend doors and make sure that they are working. The blend door that is not working properly can...
Question
Why doesn't my defroster work in my 2003 Pontiac Sunfire
Hello. If the rear defroster is working like you explain then it sounds like the rear window needs to be replaced. As the element in the window begins to short out internally various parts of it will stop working until...
Question
Electrical problems
Hello. From what you describe it would appear that your vehicle may be experiencing electrical issues, likely more than one. If the battery dies when you don't drive the vehicle for a few days then that could be a sign...
Question
My resr defroster is not working in my 2008 Dodge Caliber
Hello. Most of the time this is a problem with the TIPM> You would need a scan tool to see if there are any codes in the TIPM or to see if it is commanding the defroster to come on....
Question
Drivers side rear view mirror defogger not working and how do I repair?
Hello, thank you for writing in. The defroster within the mirror is rather simple. It uses a resistor to collect electrons which ends up resulting in heat. it is this heat that is used to defrost/defog the mirror. If the...
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...
Question
Defroster use AC for defog?
Hello - yes, the defrost function uses the air conditioning system to remove moisture from the air. The air is then re-heated using the heater functionality, and you now have hot, dry air to defrost the inside of the windshield...
Question
Why doesn't my rear window defogger work after i had my bumper fixed on my 2014 Toyota Camry
Hello. The fact that you just had the bumper repaired should not have anything to do with the bumper being repaired, though anything is possible. During the repairs it is possible that the shop caused a fuse to blow or...
Question
Does the defroster use the air conditioning system in my 2012 Ford Escape
Hello. Yes, the defroster does use the air conditioning to defog the front windshield. If the a/c system is not functioning then the system will not work as designed. If you are having issues with it, consider YourMechanic, as a...
Question
Heated windscreen
If the broken windshield that was replaced was the original OEM Ford factory installed part and that windshield did not have the complained of "line" or obstruction, then what you are seeing is not "normal". You can check to see...

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