Skip the auto shop - Our mechanics make house calls

Q: Ac is vibrating when is turned on?

asked by on

When I turn my ac on it blows out cold but then it starts making a loud vibrating sound. Every so often it might stop for a brief time but starts again. I tried out my heat n it also did the exact same also.

My car has 100000 miles.
My car has an automatic transmission.

A: The vibration is coming from the blower mot...

The vibration is coming from the blower motor. The blower motor is behind and below the glove box and sometimes it can suck in items that get caught in the blower fan and will cause vibrations and noise. You will need to have the motor removed and inspected to see it a piece of paper or something else is in the blower fan. Once it is cleaned then make sure to keep loose materials and excess items out of the glove box - as those could also be a source of vibration noises. If you want to have this checked out, a technician from YourMechanic can come to your car’s location to inspect the AC system and let you know if any repairs or adjustments are needed.

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: No start

Hi there. As you already know, repairing and replacing components without proper diagnoses can be expensive and time consuming without resolution. The engine turning over very fast, would lead me to performing a compression test. This will also give you...

Q: New A/C components with a mixture of oil added.

Your compressor, when replaced, should of called for a specific type of oil and amount to be used. Since you have put in PAG 46 and 100, it may have too much and incorrect oil in the system. You also...

Q: Car won't start, needs ignition switch replacement - 2002 Isuzu Axiom

Looking at the Isuzu repair documentation, I see no service bulletins that would indicate a programming update for an extended crank or no-start condition although there are software enhancements all of the time and not necessarily a bulletin-related to the...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...