Q: Why does my car shake when I turn the a/c on?

asked by on

Car shake when ac is turn on, the car stopped working when coming to a red light

My car has 94000 miles.
My car has an automatic transmission.

Hi there. Shaking with the A/C on can be caused by a number of reasons. The a/c compressor puts a lot of strain on the engine because the compressor is similar to being a small engine itself. When the a/c is switched on, the engine control unit should trigger components such as the idle speed/air control motor, to increase the idle slightly to compensate for the extra drag of the compressor. If that does not happen, then the additional drag can cause a low,shaky idle and even cause the engine to stall. Stalling can happen more often with the a/c on and turning the steering wheel as the power steering pump also creates drag on the engine. Excessive shaking can also be attributed to weak/broken motor mounts as well. It’s probably a good idea to have a professional mechanic complete a vehicle shaking inspection to determine why you are having these problems.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Why does my car shake when I turn the a/c on?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Is there a wire in my car that is only on when the car is off?

Hi there. Check the fuse box for any live circuits with a test light and the ignition switch turned to the off position. Then hook up your exterior lighting system to that port with a fusible link and a toggle...

Q: The cooling mood on my 2007 chevy cobalt came on out of nowhere. I had a guy pour antifreeze in and it was okay until yesterday.

Hi there. Check the coolant level to see if there is any coolant in the radiator. If there is no coolant in the radiator, then fill up the radiator with water and perform a pressure test. Check to see where...

Q: The rpm in my truck is high while I'm in first gear then drops to normal once i accelerate

Hi Michael. Thanks for contacting us today. A high idle speed while not in gear is often caused by a faulty idle control valve or vacuum leak. It would probably be best to have a mechanic diagnose this issue correctly...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...