AC Troubleshooting
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This is a discussion on AC Troubleshooting within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hi guys, I know there have been a lot of AC related posts and I've read them all. So please ...

  1. #1
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    AC Troubleshooting

    Hi guys, I know there have been a lot of AC related posts and I've read them all. So please bear with me.

    The system was empty from the beginning. I used a vacuum pump and it was able to hold -30psi for 2 hours.

    I tried filling it with refrigerant on the low side but it went to 40 psi (at 29 degrees C) after 3 seconds and it looked like the system would not take anymore refrigerant. I tried the AC and the compressor was running, but still no cold air.

    My guess is that the expansion valve is stuck?

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  3. #2
    Supporting Member yamaha_rider619's Avatar
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    Did you try putting more refrigerant into after you tried the ac?

    I don't per se know your problem, but it should take refrigerant pretty easily.
    Josh
    2003 Subaru Wrx Vf39'd
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  4. #3
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    yes, I tried with the AC on and checked with manifold gauges, low side was 70psi and high side was 250psi. Reached this pressure in 5 secs

  5. #4
    Supporting Member yamaha_rider619's Avatar
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    Are you sure the refrigerant isn't full, it would stop taking if it was full. I cant remember the steps exactly, but I just did it not even 6 months ago and it was basic and simple.

    Do your ac compressor wine?
    Josh
    2003 Subaru Wrx Vf39'd
    Bugeye mafia #300

  6. #5
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    The system was empty before starting the recharge.

    The compressor does make a sound, not sure if its a whine

  7. #6
    Supporting Member yamaha_rider619's Avatar
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    Your compressor is on its way out.
    Josh
    2003 Subaru Wrx Vf39'd
    Bugeye mafia #300

  8. #7
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    Problem solved. I forgot to rev the engine to 1,500 rpm

    But I noticed something funny, one vent seems colder than the others...
    Last edited by minduka; 07-05-2011 at 04:02 PM.

  9. #8
    Supporting Member yamaha_rider619's Avatar
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    Give it some time and use before diagnosing that.
    Josh
    2003 Subaru Wrx Vf39'd
    Bugeye mafia #300

  10. #9
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    Oh crap I can hear a leak. If you can hear it must be big

  11. #10
    Supporting Member yamaha_rider619's Avatar
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    Might not be big, Ac leaks turn into gas as soon as it hits the atmosphere. I have heard of the Ac leak fix one car, might not hurt to try that...
    Josh
    2003 Subaru Wrx Vf39'd
    Bugeye mafia #300

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