Skip the auto shop - Our mechanics make house calls

Q: SUV hesitates when air on

asked by on

The SUV hesitates when the air conditioner is engaged, and the engine goes into reduced power mode.

A: Hi. The AC compressor runs off the serpenti...

Hi. The AC compressor runs off the serpentine belt which is driven by the engine. Therefore, turning on the AC puts a load on the engine. If there is a problem with the compressor, this may max the engine more than normal, causing drivability problems. On the other hand, it may be engine performance that is the root issue. If the engine isn't running the way it should, the extra load from the compressor may cause it to go into reduced power mode. If you need further assistance, I recommend you have a certified technician, like one from YourMechanic, diagnose the power loss on your vehicle and suggest an appropriate repair.

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・Save up to 30%

Get a quote

What others are asking

Q: The service 4WD/Service Engine Soon Light is on, and my car has front end noise.

Hi and thanks for contacting YourMechanic. This sounds like the front differential has medal particles in the gear assembly, and if so, you will have to remove the differential and have it diagnosed from the inside to see what bearing...

Q: Power loss driving uphill

The vehicle's engine may be starving for fuel. The fuel pressure would need to be checked to see if it is within specifications, and the fuel filter and pump may need to be replaced; a mechanic will be able to...

Q: Transmission fluid leak

Hello. If you have transmission fluid coming from the front of your vehicle, then you either have a ruptured cooler line or the radiator has cracked where the cooler lines go. I would start by getting under the vehicle to...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...