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When the air conditioner comes on, which includes turning on the defroster at low temeprature ranges, it draws a lot of power from the engine. This can result in a decrease in idle speed and less available power on starting off from a start. This is often felt as a shaking or jerking. It is possible that the idle is low or that there are problems preventing full power.

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Q: Why does your car jerk when you use the defroster or air condisher?
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Why does your car air conditioner keep terning on?

If you have the defroster in the on position the ac will do that.


Why does your car run the air-conditioning unit when the defroster is on?

dry air removes moisture better


93 ford escort wagon when you turn the defroster on the air blows out the vents instead of on the the top of the dashboard?

Because it's not a defroster button! It's just the symbol for ventilating the air into the car. It shoudln't be called a defroster since defrosting is meant by heating up the coils that you see at the back of the car. I'm pretty no car has wires in the front!


Why is Car is purring when defroster is turned on?

It is probably the sound of the defroster fan.


What car had the first rear window defroster?

The 1953 Lincoln was the first car that had a rear window defroster. It also was the first car to have an optional 4 way power seat.


Why does my air conditioner hiss and jerk the car then blow hot air then jerk and hiss again and then blow cold?

Your A/C compressor is shot. It's internal computer (or that of your car) is malfunctioning. The "jerk" is when your "A/C" kicks in...an A/C compressor takes much of your cars usable power. As it turns on and off you will get the hiss and jerk. (the hiss comes from the overworked compressor lines cooling)


Does using the defroster in your car use more gas?

yes, it works just like the a/c, it just blows the air on the windsheild/windows


What things are in a car that start with w or on a car?

windshieldwheelwater pumpwindowwindow defroster


What makes car jerk when the air conditioner is on?

The AC compressor puts quite a load on the engine, especially one with less cylinders. It puts a load on the engine, causing it to jerk back and forth.


Where is the defroster in a car?

the defroster is actually your a/c. it doesn't run much when it's cold outside but it works with your heater to remove the moisture from inside the car. blowing warm dry air on the windshield. just like it removes the moisture (humidity) from inside the car in the summer. the difference is the temp. you have it on. even if the a/c don't work, the heater will still do the job, just not quite as well.


Does a broken thermostat cause the defroster inside your car to put frost on your inside window instead of remove it?

If the defroster is blowing hot air and it is still leaving moisture on the inside of the windshield, the heater core may be leaking coolant causing that condition. If the defroster is blowing cold air it could be the cooling system is low on coolant, or the thermostat is stuck open or the heater core is plugged up or the temp blend door has a malfunction.


Why do your car jerk while driving when you run the air conditioner and when its not running?

the air conditioner shouldn't have anything to do with it. there could be a problem with your tires or your driving or your kid could be jumping on the seat