Quick Answer: Why does my car run weird when AC is on?

How do you fix a rough idle when AC is on?

After cleaning start the engine and let it idle for at least 20 minutes while the system learns it’s new throttle position. This vehicle should relearn on its own. It may need to be revved up and put in gear several times during the learing time.

Why does my engine lose power when AC is on?

Your car has just under 150 horse power, the a/c compressor puts load on the engine when it is switched on. A lot of cars disable the compressor momentarily on hard acceleration so as to reduce the power loss and let you get horsepower when you need it.

How do I know if my car AC compressor is bad?

Four Signs Your Car’s AC Compressor Is Going Bad

  1. Odd Sounds. You might hear some strange noises when you flip on your vehicle’s air conditioner and if you do, it’s probably the compressor. …
  2. Hot Air. The whole point of turning on your vehicle’s AC is to get cold air to come through the vents. …
  3. Fluid Leaks. …
  4. Stuck Clutch.
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Can a bad AC compressor cause power loss?

, 15 years as a professional mechanic. Engines lacking in torque lose power and acceleration when the AC compressor is running. This is particularly noticeable in older vehicles which used higher drag compressors for some reason.

Do cars lose power with AC on?

Your car’s AC system is powered by the engine

When the AC system kicks on, you might notice that the engine RPM increases a little. According to Your Mechanic, the car does this in order to offset the power drawn by the AC system, so there’s no doubt that the system robs your engine of horsepower when it’s activated.

How often do car AC compressors go bad?

The answer depends on age and how often you use your car ac. As you drive your car and over a long time, the AC compressor will start malfunctioning. However, you can expect your AC compressor to last 8-12 years.

How do I test my car AC compressor?

Turn on the AC. Connect a pressure gauge to the low side of the AC compressor, typically found on the firewall passenger side in the engine compartment. Add approximately 2 oz. of Freon to determine whether the compressor kicks on (if it does, you will hear a loud click followed by a puttering sound).

How do I know if I need Freon in my car?

Well, there are a few signs to look for.

  1. Room Temperature Air. One of the most characteristic symptoms of low freon is the presence of room temperature air blowing from the vents. …
  2. Visible Leaks. Of course, another sign of low freon levels is a visible leak. …
  3. Clutch Doesn’t Engage. …
  4. Ice on Compressor.
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What does it mean when your car jerks while idling?

Along with faulty spark plugs, a build-up of dirt and grime is the likely cause of cars stuttering when idle. A clogged filter or fuel injection system can starve your engine of fuel or oxygen, causing your car to judder and shake.

Can a bad AC compressor cause rough idle?

When the additional load of your AC compressor is added, it causes the computer to miscalculate and increase idle speed too much. Common sources of carbon buildup include the IAC valve, the EGR valve, and the throttle body.