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What causes your car to speed up when ac engages?

Updated: 8/16/2019
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16y ago

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Vehicle could have a solenoid type switch to increase idle to compensate for load on engine caused by A/C compressor

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Q: What causes your car to speed up when ac engages?
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What causes a '93 Civic to idle rough and want to die when the AC is on?

When you turn the ac on it engages the ac clutch which is turned by a fan belt which is turn by the engine. you are making the engine work harder. The idle speed might be set to low or it,s time for a tune up.


What can cause the car to stall when running the ac?

An engine usually has a higher idle speed when the ac is running. If the high speed idle does not operate then the ac will cause the engine to stall.


AC reduce's car performance?

only when it is on, it causes slow acceleration


What makes a Car shak when ac fans kick on?

The A/C compressor puts an extra load on the engine when it engages. This is most likely the engine hesitation you are experiencing.


When AC is on causes the car to go why is this?

Idle compenstorVehicles hve an idle copensator that speeds up the engine when the ac is turned on to ring the rpm back up to the proper idle speed, if yours is too fast then t needs to be adjsted.


Ac lines are all cold and sweaty but blowing only hot air inside what causes this?

I have a 2002 Jeep Grand Cherokee Laredo that was doing the same thing. The problem was a faulty ac/heater switch. You put the switch on ac, compresser engages, lines get cold and frosty, but only hot air is coming out of the vents, because the switch has changed back to heater even though it shows ac. The cure is to have the center panel which contains the ac/heater switch, fan speed switch and temperature control replaced.


Why is your car ac blowing hot air?

There are three main possible causes to explain why a car air conditioner is blowing hot air. These causes are a worn out compressor, refrigerant leak, and an electrical problem.


Why is your car making a grinding noise when you have the AC or heat on and you brake to slow the car and or give it gas?

It is probably a worn blower motor, because it happens with AC, and/or HEAT. When you brake or speed up, you are changing the speed of the motor (adding and taking away resistance to it's spinning). This will cause more of a noise until you reach your cruising speed again.


1999 Toyota solara ac fan only runs on 1 speed?

Maybe not. While this may or may not be the case with your model, the fan(s) often work at one speed when the air conditioner is running and another speed when it's turned off. If the fan(s) are operating to cool the engine they'll generally kick into a higher speed mode when the AC engages. In some vehicles only one fan is used to cool the engine but both fans come on when the AC is functioning. Bottom line, if your car isn't over heating you don't have anything to worry about (as long as you've changed coolant and flushed the cooling system per the schedule in your owners manual). Cheers


What causes Altima stalls at idle with the ac running?

When the ac is running the idle should be raised to compensate for the extra load. If the idle isn't rising then the car will cut off.


AC for Honda Civic work when park in cool place and runs for a while then just blow hot air If the car park in sun AC won't work. Some time car need to run to high speed to make AC work?

the system needs to be recharged with refrigerant


What is wrong with a car that only picks up speed when ac is off?

it is totally normal especially for a 4cyl car your air conditioning is compressing air so that why it is sluggish with it on