Air con makes car rattle

Brian L

New Member
I am in uk
May 31, 2017
11
5
3
Next thing to sort out is a rattle from the exhaust that happens when the air con is on, the air con pump turns off and on when switched on, there is a slight rattle from the pump like the bearing is going but anyone any ideas why the engine starts to vibrate more causing the exhaust to go psycho, does the air con need regassed or the the pump replaced?

Any ideas much appreciated
 

clivehorridge

Well-Known Member
Guru
I am in romania
May 23, 2012
14,870
4,870
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Comarnic, Romania
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I have (and I think most will have) on the 80 series, an idle-up so that as the pump kicks in, the revs will be lifted a 100 rpm or so to compensate for the extra load.

Presuming this only happens when idling, not when you're driving?
 
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silvercruiser

Well-Known Member
Mar 22, 2010
3,332
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Essex
I have watched my aircon closely today (thanks Frank) and when engaged i can see the pulley start to wobble on the compressor (not much wobble but just enough to see by eye) and that is enough to make the engine feel a bit lumpy. so maybe yours is the same. Its worth a look.
 

Chris

Super Moderator
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I am in europe
Feb 24, 2010
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Chesterfield, Derbyshire
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Was that the pump Joe or the tensioner? It's a cheap little bearing in there and if over tensioned doesn't last long. Bad news if it's the pump. You can get replacements quite cheaply. Someone posted a link a while back. I need one too. My overland 80 pump is leaking badly.
 

silvercruiser

Well-Known Member
Mar 22, 2010
3,332
238
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Essex
Its the Pump Chris. all is fine until the magnetic clutch pulls in and then you can see the wobble so the thrust bearing in the pump is on its way out. i did think about replacing the bearing but the whole lot needs to be split then i need new seal etc, so im looking at a new pump for ease really.
on my lc120 you cant over tension it as its sprung loaded.
 

Brian L

New Member
I am in uk
May 31, 2017
11
5
3
I'am getting this noise a bit but the exhaust has starting rattling as well, sounds like there's a stone in it(maybe there is!!) will have to get under and get a look.... could part of the reason be that there is a leak in the system and when there isn't much gas left the system starts to struggle as it has nothing to pump around thus creating vibration, just a thought, going to get an aircon service soon
 

Brian L

New Member
I am in uk
May 31, 2017
11
5
3
well I found the problem, it was a split in the exhaust in the tail pipe, just where it bends over the top of the rear axle, it split that much on opposite sides they rattled together, new tail pipe I reckon!!
 
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