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Unread 04-09-2013, 12:56 PM   #1
massarosareloud
Registered User
1996 ZJ 
 
Join Date: Dec 2012
Posts: 218
Pulsating humming sound when using A/C

So since this is the first time I've had my Jeep where it was warm enough to use the A/C, I figured I'd give it a shot. It is nice and cold, and I didn't realize this until I got home and the engine wasn't making so much noise, but there is a pulsating humming sound that sounds like its coming from under the driver seat. I popped the hood and got out and couldn't hear it unless I was in the car. It is the automatic style controls, and when I turned off the A/C compressor (using the snowflake button) the humming stopped. It is very repetitive, maybe in a sequence like this: "hum for 1 sec, silence for 1 sec, repeats".

Any idea what this is? Low on coolant? Needs a new clutch?

Let me know if you need more info, thanks a bunch!

Oh and its the 6cyl engine, if that helps.

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1996 Jeep Grand Cherokee Limited Edition 4.0L
3.55 axles, stock pretty much everything, except for a PSC steering gear and fuel injectors
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Unread 04-09-2013, 01:23 PM   #2
just_urd
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1998 ZJ 
 
Join Date: Feb 2013
Location: Whittier, California
Posts: 136
Probably just a difference in load to the engine when the compressor kicks on causing a difference in sound/vibration throughout.
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Unread 04-09-2013, 03:03 PM   #3
massarosareloud
Registered User
1996 ZJ 
 
Join Date: Dec 2012
Posts: 218
That makes sense, I did notice I had a lot less power once I turned on the A/C.
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1996 Jeep Grand Cherokee Limited Edition 4.0L
3.55 axles, stock pretty much everything, except for a PSC steering gear and fuel injectors
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