Skip the auto shop - Our mechanics make house calls

Q: When start A/C car engine not give power

asked by on

When start A/C on car, knocking sound from engine come and engine does not pull load easily and A/C stop working when car stop on signal etc.

My car has 12 miles.
My car has a manual transmission.

A: This is a common sound when idle pulleys an...

This is a common sound when idle pulleys and other bearings wear out. When the AC compressor begins to fail or freeze up, this puts an excessive load on the engine causing it to knock due to the heavy load this puts on it. Due to the very small size and power of the motor in this car it does not take much of a struggle for it to cause this type of knocking. I would recommend having an expert from YourMechanic come to your home to diagnose and repair the loss of power problem.

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: Burning Smell and Squeaking Wheel 2007 Honda Civic

Hello - the smell and "hot" symptoms you describe suggest your rear brake is dragging on that rear wheel. This could be an emergency brake cable which is not releasing, or a frozen brake cylinder or caliper. I recommend a...

Q: Crash damage - Front, Passenger suspension damage 1997 Honda Civic

Hi there - this task is best handled by a collision repair estimator at a reputable paint and body shop. S/he is trained to evaluate visible and not-so-visible damage, and the costs to repair. Contact a reputable paint and body...

Q: Engine has a cranking noise and car vibrates... also service engine soon light is on

Hello. The symptoms you describe would suggest that the starter is not disengaging immediately from the engine. This is caused by damage to either the starter drive, the engine's flexplate (or flywheel) or both. The symptoms will only become worse,...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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.