Skip the auto shop - Our mechanics make house calls

Q: Car shuts down

asked by on

My car runs smoothly, but when I turn the AC while driving it suddenly shuts off but when the car is "Parked" doesn't shut off but the motor drops like RPM, it feels like lazy. I ve done a test, and when the car is parked, on, and with the AC off, the motor is normal, but at soon as I turn the AC on the car somehow looses power even so that the interior lights and the headlight loose brightness, like from %100 to %40 light. Even when the AC on, the radio somehow loose power that music goes from high to low to high, like a wave. Another symptom is that, when I turn the AC on, the car shakes a lot, like a 5th category earthquake, and when I see the belt that its with the AC, the belt shakes like a wave like this (~~~~~~) but the belt is good and also the tension. For your knowledge, when the AC is Off the Engine works %100, no vibrating, no light brightness lost, no radio problem and doesn't shut off. The problem is when the AC is on, is like the Engine can't hold the power for the AC.

My car has 167000 miles.
My car has an automatic transmission.

Hi there. Any time you run the A/C, the car will be reduced in horse power because the A/C runs off of a belt that powers the compressor. If the compressor is failing or was faulty to begin with, this would cause excess load on the engine and in some cases, the "earthquake level" shaking. It’s a good idea to have a professional mobile mechanic come to your location to complete a car is shaking and vibrating inspection to determine what is the precise source of this issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: When the car is stopped and in gear, the engine often shakes and nearly stalls when the air conditioner is turned on

Hey there. There is an A/C idle-up VSV (vacuum switching valve) on your vehicle. The purpose of that valve is to increase engine speed at idle to accommodate the added load of the A/C compressor when the A/C switches on....

Q: Radio interior lights IOD

Since the problems go away when the radio harness is unplugged, this sounds like a bad ground, or loose power supply connection related to that installation. The Ignition Off Draw fuse is on the main fuse block. Your Owner's Manual...

Q: Driver's side window not going up or down.

What the shop is talking about is that the mounting points for the window regulator that holds the window have stripped out, or are broken. Depending on how and what is damaged, repair may be possible. However, the opposite could...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.