A/C vibration/humming

SCNICHOL24

MEMBER
1994 LINCOLN TOWN CAR
4.6L
V8
2WD
AUTOMATIC
174,000 MILES

After about a mile of driving with the A/C on, I feel a vibration and hear a humming sound. If I turn off the A/C, the noise/vibration stops.
Is this the clutch or the compressor itself?

Monday, October 21st, 2019 AT 4:43 PM

3 Replies

KASEKENNY

MECHANIC
18,907 POSTS

Hi,

More than likely it is just the clutch pulley assembly. The pulley has a bearing on it that when it wears out it will actually move around and cause this noise. The fact that it only does it when the AC is on, I would just go ahead and replace the clutch and pulley assembly since you have to take it off anyway.

Let me know if you have questions.

Here is a guide that shows the compressor replacement in case you chose to go that route:

https://www.2carpros.com/articles/replace-air-conditioner-compressor

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Tuesday, October 22nd, 2019 AT 4:58 PM

SCNICHOL24

MEMBER
2 POSTS

Thanks for your answer! I will go ahead and try the clutch first.
Love this website!

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Tuesday, October 22nd, 2019 AT 5:50 PM

KASEKENNY

MECHANIC
18,907 POSTS

Sounds great. Please let us know what happens and we can dig further if needed. However, I suspect you will get it with that. Plus that information will help others that have this issue so if it fixes it, let us know. Thanks for the kind words. Talk to you later. Thanks

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Tuesday, October 22nd, 2019 AT 5:54 PM