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a/c not working

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Old Jul 23, 2009 | 12:59 PM
  #11  
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ok i got a new condenser fan and it turns on, but the a/c still doesn't cool.
 
Old Jul 23, 2009 | 03:40 PM
  #12  
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you need to recharge it then
 
Old Jul 23, 2009 | 03:54 PM
  #13  
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So at this point, if you press the A/C button with the blower and engine running, the A/C button light illuminates, the condenser fan runs, and the compressor clutch engages, right? If so:

-Is the A/C belt tight?

-Is the A/C system stock? Is it an R12 or R134a system? If the latter, was it converted from R12?

-Prior to adding refrigerant, did you evacuate the system and replace the receiver/dryer? How much refrigerant did you add to the system?

-Do you have or can you get a manifold gauge set to measure refrigerant pressure on the low and high sides?
 
Old Jul 24, 2009 | 08:47 AM
  #14  
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yes the ac belt is on there tight and the a/c system is stock r12. The system was evacuated but the dryer wasn't replaced. At firs the compressor was making some noise but then added some oil and noise was gone. I will try to put some gauges on it to see the readings of the high and low side
 
Old Jul 24, 2009 | 08:51 AM
  #15  
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Originally Posted by import4life
yes the ac belt is on there tight and the a/c system is stock r12. The system was evacuated but the dryer wasn't replaced. At firs the compressor was making some noise but then added some oil and noise was gone. I will try to put some gauges on it to see the readings of the high and low side
Yeah, at this point, the gauge readings are essential. Typically, anytime the closed A/C system is opened, you must replace the dryer/receiver. Was the system recharged with R12? How much?

At 80F outside temp with the A/C running and the engine idling in the shade, the low side should read ~36 PSI and the high side should read ~320 PSI.
 

Last edited by RonJ; Jul 24, 2009 at 08:54 AM.
Old Jul 24, 2009 | 08:55 AM
  #16  
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I put some gauges on it and with the engine at idle the low side is about 100 and the high side is 110 but with the engine reving the low side goes to 60 and the high side is at 110.
 
Old Jul 24, 2009 | 08:57 AM
  #17  
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oh and i put about 2 small 12oz. cans
 
Old Jul 24, 2009 | 09:04 AM
  #18  
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Was the fan running and the clutch engaged when you made your readings? If so, my guess is that the compressor is shot.
 
Old Jul 24, 2009 | 09:15 AM
  #19  
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yes the fan and clutch were engaged. I will try to replace my compressor sometime this weekend. Now someone was telling me that it could be my evap core or even my expansion valve. How can i tell if these are bad also?
 
Old Jul 24, 2009 | 09:24 AM
  #20  
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Your pressures have two problems. The low side (suction) is too high and the high side (discharge) is too low. Here's what the manual says about troubleshooting these two problems:

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