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AC Compressor shutter

 
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Old 07-07-2019, 10:34 AM
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Default AC Compressor shutter

Anyone ever heard this noise? I have isolated it to the ac compressor, it only does this when the ac is off or when the car has just started while the ac is kicking in.
 

Last edited by Reklaw1973; 07-07-2019 at 10:38 AM.
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Old 07-07-2019, 11:07 AM
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You might check the pulley support bearing. It does not do as much when the clutch is engaged as the shaft bearings do most of the work.

Just a thought. Try removing the belt and grabbing the pulley to check for 'play' in the bearing?

Also check the idler and tensioner pulleys just because.

bob
 
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Old 07-09-2019, 05:59 AM
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Its the clutch. You need to get that fixed asap or else it'll come off and the belt will no longer turn. Keep RPMs low and no hard accelerations until you get it fixed. (I was a FEAD engineer for 6 yrs)


I've not worked on a jag compressor but chances are good you can just replace the clutch itself and not have to remove the compressor.
 
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Old 07-15-2019, 09:21 AM
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Default Repair AC Compressor on STR? I would love that.

I will take a look at the clutch and pulleys.
I would LOVE it if I could just fix the actual problem instead of replacing whole parts. It seems to make so much more sense to me.
But, pretty much every repair on this car seems to require replacement of a whole part :/
Replacing the AC Compressor on the 4.2l SC engine requires lifting the whole engine off mounts so the bolts will clear a support bar. Pain in the ***.
I have not rolled under there to see what clearance I have to work on just the clutch/pulley, but I am super tempted to just try replacing THAT over the whole pump.
I have replaced the stupid pump twice so far, and now this.
(first replacement was bad from the factory, clutch didnít work correctly. Second replacement is currently the one we are talking about)
Anyone with experience doing this, your advice would be appreciated.
 
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Old 07-15-2019, 09:31 AM
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Default Climate control unit

Another idea that has been floated, was the Climate control module circuit through the compressor. Could a problem with the climate control module, a wiring issue between the module and the compressor coil cause incomplete clutch engagement?
The idea was that module, wiring or ground could result in less than 12v being sent through the coil, resulting in weak clutch engagement, thus causing excessive wear on the clutch.
Anyone ever heard of this?
 
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Old 07-15-2019, 12:04 PM
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Originally Posted by Reklaw1973 View Post
The idea was that module, wiring or ground could result in less than 12v being sent through the coil, resulting in weak clutch engagement, thus causing excessive wear on the clutch.

I experienced a slipping clutch on my '02 due to arcing at the compressor clutch control relay. Pics of the burnt relay are in post #4 here:

https://www.jaguarforums.com/forum/s...2/#post1714573


However, when that happened, the AC performance dropped way off. The coldest temperature I could get from the dash vents was about 50F, not 38F like it should be. The problem was very obvious. Who knows, maybe your car was only putting out 50F air, but that seemed normal to you, I don't know. This is why I keep an inexpensive thermometer in the dash vent at all times. It helps me keep an eye on the AC performance, so I can catch a minor problem before it becomes worse.

For giggles, you can remove that relay and pop off the cover. Look for evidence of arcing inside the cover.

For your noise issue, try loosening the serpentine belt. With the engine off, have a helper hold a breaker bar on the tensioner. With the tension released, crawl underneath and try to wiggle the main body of the compressor pulley, the part where the belt rides. I suspect you will find some play there.

I find it curious that you only get the noise when the AC is off. That sure seems to point to a problem with the clutch assembly wobbling around. I don't think that excessive wear on the clutch face (from low clamping force, for example) would cause this noise. When de-energized, you'd have extra clearance, not less. And in the case of extreme wear, you'd have reduced AC performance (due to slippage when energized), but is that the case?
 
 
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