Q: SUV hesitates when air on

asked by on February 13, 2016

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

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

Can 2 serpentine belts need replacing within 11 years and can the alternator suddenly fail without warning ?

Hello. There is a huge variance in manufacturer estimates of serpentine belt lifetime. This is understandable because operating conditions vary, vehicle designs vary and the belt material will degrade at different rates. You should get at least 50,000 miles out...

Carfax shows minor damage no airbag deployed. Is it ok to buy?

Carfax reports unfortunately only reflect any work or damage that was reported to Carfax. I would suggest checking the Kelly Blue Book website with specifics related to your zip code as market prices of cars vary by zip code. This...

Engine and battery light on car lost power after driving for 5 minutes

Hi, thanks for writing in. This may be a result of a few different things such as a bad ground connection, a weak battery, a faulty alternator or potentially a failing voltage regulator. The harmonic balancer does not have any...

Related articles

The Best Used Cars to Buy For a Graduation Gift
Your Your little bundle of joy has grown up and on the cusp of entering adulthood. Graduating is a milestone, and you want to reward their hard work and show how proud you are. Buying a used car is a...
How to Get Buick Dealership Certified
GM/Buick car dealerships offer automotive technician jobs to mechanics who are certified through the Universal Technical Institute (UTI) and GM.
2012 GMC Acadia vs. 2012 Dodge Journey: Which One Should I Buy?
The GMC Acadia is classed as a midsize SUV, which is able to seat between six and seven passengers comfortably. The 2012 Acadia offers three rows of seating, so passengers will feel the roominess that is typical in a true...