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  #1  
Old 07-02-2010, 05:41 PM
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Default AC pressure sensor?

Hi

I just got CEL on my S70 this morning, 2 codes: p0446 (Evaporative emissions control vent circuit low) and p0531 (ac pressure sensor circuit performance/range).
- had a cracked "j hose" and i was hoping that replacing it would take care of first code but it didnt?! What else can trigger this code?
-I did search on second code and no luck. My ac works when I first turn it on and it shuts off after few minutes. I thought this means bad clutch on compressor? but this code for ac pressure sensor makes me wonder if its something else? Which sensor is this, where is it located?
Any help would be greatly appreciated
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Old 07-04-2010, 08:06 AM
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1. Is any of the other hoses by the fuel filter cracked? If not the evap valve can stick sometimes.

2. It could be the high pressure switch located behind the passenger headlight.
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Old 07-04-2010, 08:26 AM
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Hoses were fine. Shut off valve was the problem. I replaced it. No more p0446 code.

I changed high pressure switch as well, nothing changed, i only have ac for first 5 minutes. I think i am going to replace ac compressor because clutch is probably gone and then see if code comes back.

thanks tech!
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Old 07-04-2010, 08:35 AM
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To test the clutch to see if it is bad start the A/C and when it quits working check for power at the compressor. If you have power it is the clutch. If you have no power then it is something else.
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1996 850 turbo
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Old 07-04-2010, 05:31 PM
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I just did that. Clutch is bad. Thanks! Now i am sure i need new compressor.
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Old 07-04-2010, 07:27 PM
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If you are really handy you can reshim it. It is a pain but can be done.
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1996 850 turbo
1994 N/A 5-speed wagon Purple (daughters)
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Old 07-04-2010, 07:27 PM
 
 
 
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850, ac, censor, defective, jump, p0531, performance, power, pressure, replace, sensor, switch, transducer, v40, volvo


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