Alfa Romeo Forum banner

1 - 11 of 11 Posts

·
Registered
Joined
·
44 Posts
Discussion Starter #1
Hi All

So I have problem that is slowly getting worse. When the AC is on and I am driving there is an intermittent whirring / light grinding noise. This noise stops as soon as the AC is turned off. The noise is usually louder when the car is coasting in gear ie foot off the gas.

Mangos have told me that it is likely the AC compressor clutch and will cost £££ to replace the whole compressor assembly.

I have done a DIY re-gas to no avail.

Anyone have any suggestions or experience before I bite the bullet and empty to wallet at Mangos ?
Would a professional vacuum / re-gas be worth it !

Thanks in advance
Ben
 

·
Registered
Joined
·
2,518 Posts
No expert no the 159 air con but in general I know a thing or two. A noisy compressor is nearly always going to be down to main bearing and/or clutch assembly for sure. Anything else doesn't make much sense to do once you have a noisy pump in my opinion. But on the other hand, if it ain't broke...? My 164 has had a very noisy compressor since I got it 7 years ago and it's still running after 20 years of service!

Perhaps it's thanks to following three handy tips to prolonging the life of your AC. Never switch off the car with the AC engaged, never switch off the car with the AC engaged, never switch off the car with the AC engaged! Not saying that this has been the cause in your case as sometimes they do just fail.
 

·
Registered
Joined
·
2,518 Posts
TBH I don't know why exactly. For some reason it puts extra stress either on the shut down itself or later on the restart. All I know is what I've mentioned re the 164. Every year I get the feeling the compressor will die and it just keeps going.

Since we're on the subject. Another handy tip to avoid the build up of humidity related bacteria and eventual bad smells is when I'm parking up, I switch the AC off so the whole system warms up a bit. Cold ducts will attract humidity when there is no AC running through so by doing this you avoid bacteria building up. The 164 has no typical old car AC smells and it's 20 years old!
 

·
Registered
Joined
·
256 Posts
Mine has broken twice and on both occasions it was the clutch. Bad news is the part isn't made any more (so I was told) so it's reconditioned units only. Good news was manufacturer's warranty covered it both times. Bloody terrifying noise when it went though!
 

·
Registered
Joined
·
1,589 Posts
are you sure you are not hearing the AC fan which pulses with the aircon to cool the condenser?
 

·
Registered
Joined
·
44 Posts
Discussion Starter #7
are you sure you are not hearing the AC fan which pulses with the aircon to cool the condenser?
No its definitely not the fan, unfortunately.

I think I will just keep my fingers crossed and see how long it last, before trying to source a recon'ed unit to replace it.

Thanks All.
 

·
Registered
Joined
·
171 Posts
v6 junky, I had a Peugeot 406 from new for 12 years, and I just left the a/c on ALL of the time, and it still worked when I sold the car no re-gas or anything throughout its life.

I am continuing the same policy with my 159 (for the last 3 years) and all is well with the a/c.

I'm not saying that you are incorrect turning the a/c off before stopping engine but I don't see what the benefits are? Could you explain?
 

·
Registered
Joined
·
2,518 Posts
Theoretically you shouldn't have to. Leaving the AC on should not be a problem as the clutch 'should' disengage but that's theory. In real life I've heard many AC specialists give this advice and I'm sticking to it as anything that can create less wear and tear should be welcomed.

However, there is the mold issue to consider also. I live in an extremely hot climate and mold build up can be a problem. I always switch off when about to park primarily to avoid moisture settling in the pipes and creating mold. If there is a 'possibility' that I can prolong the life of my compressor then that's a worthwhile bonus.
 
1 - 11 of 11 Posts
Top