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Discussion Starter · #1 ·
Occasionally when driving I hear a clicking sound coming from somewhere behind the radio. The clicking was said to be the AC compressor relay, according to a service manager. The noise occurs when the compressor engages or disengages, so it made sense. The noise had gotten more frequent a few months ago because of slightly low freon. This made the system cycle more than it should. So it all made sense. He claimed the noise was normal and that recharging should solve most of the issue. I still hear it occasionally, so no big deal.<p>I was still wanting to confirm if this is actually a normal noise. I have been told many abnormal automotive issues are normal by mechanics, so I was wanting to verify this. Anyone without the automatic climate control experiencing this? Or do I need to raise issue again and push for the replacement of some parts. I just find it odd that a car of this level has a quirk like this.<p>Otherwise the air works fine. I had searched and found a post referencing this issue when parked, but not while driving. It was also around three years old, and I thought more people might have experience with this now.<p>Thanks for any and all input.<p>2008 S40 2.4i<br>Manual temp control<br>10k miles
 

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Discussion Starter · #2 ·
Re: AC Compressor Noise (lawsotk)

If my post is oddly worded, please forgive me. I have been working on my thesis today since sometime around 8 am central time.
 

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Re: AC Compressor Noise (lawsotk)

I have the electronic climate control (dual zone in other words) on my S40 T5 and I've been hearing it these years. It's quite loud compared to other cars I had. In fact, you can easily replicate the noise by switching on or off the aircon.<p>On a side note, my A/C solenoid clutch (as mentioned on the service receipt) recently packed up after 4.5 years. It failed to engage the compressor a few times on hot days and the car turned into an instant greenhouse. The repair made the wallet lighter by US$700 but after that the car became a freezer. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0">
 

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Re: AC Compressor Noise (lawsotk)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>lawsotk</b> »</i></TD></TR><TR><TD CLASS="quote">I just find it odd that a car of this level has a quirk like this.</TD></TR></TABLE><p>Brace yourself, you'll be surperised at the amount of quirks these cars can throw at you lol <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/rolleyes.gif" BORDER="0"> <p>Btw, no clicking from my ACC A/C, only notice a slight increase in rpm when stationary, nothing else.<br>
 

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I'm not sure if reviving old threads is against the rules here, but this sounds exactly like what I'm experiencing on my 2005 V50. If you're still around, did you ever figure out whether or not it's normal? I hear the click you're describing a few times a minute but the AC seems to be working fine otherwise.
 

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Discussion Starter · #7 ·
Best I can tell, it was the compressor/relay engaging or disengaging. The system was recharged, and it did help, didn't go away completely.
 

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Cycling of the A/C compressor clutch is normal. The compressor will run until a certain pressure is reached in the system and then shut off until the pressure drops to a given low pressure.

There are several factors effecting the clutch cycle time including outside air temperature and humidity, refrigerant charge level, condition of a/c system components, air flow through the condenser and some others I can't think of right now.

As long as your system cools adequately, I wouldn't be too concerned with the clutch cycling.
 

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Thanks for the feedback, guys. I had accepted that the compressor didn't need to run as much this time of year, but I thought that cycling on or off every ~15 seconds of every ride seemed excessive.
 

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I also have this noise it is irritating. Does anyone know exactly where the AC compressor relay is located? Is it in the CEM under the glove box, if so which one is it?
 

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Discussion Starter · #11 ·
Not sure the location. Sounds about right though, remember reading about someone getting it swapped out and sounded like it was a major ordeal regarding disassembly.
 

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Not sure the location. Sounds about right though, remember reading about someone getting it swapped out and sounded like it was a major ordeal regarding disassembly.
Cool, if you remember where that thread was let us know. I found the complete list of wiring diagrams for a ton on models here

http://www.matthewsvolvosite.com/volvo-wiring-diagrams/

My head is spinning with electrical diagrams but these are certainly resourceful tools
 
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