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  1. #1

    Overfilled AC unit; now issues are expected

    Friday the 13th.

    I overfilled my AC unit, and now my AC system isn't as cool as it should be.
    I did manage to take it to the shop and suck out the existing freon and refill it, but I think the damage is done.

    The compressor makes a weird noise, however it is still working.
    I have a new compressor, evaporator, and dryer on the way, and most likely I will have to install these.

    Currently the AC blows cold air, but I was told the compressor will definitely fail.

    Anyone else have to replace the AC unit? Is it a terrible job?

  2. #2
    Join Date
    Jan 2013
    Location
    Central California
    Posts
    687
    I understand replacing the compressor and dyer but why the evaporator? I could be wrong but I believe the entire dash has to come out to replace the evaporator. That's not a job you wanna do on a whim.

  3. #3
    Join Date
    Aug 2011
    Location
    Las Vegas, NV
    Posts
    5,877
    Not only is overcharging your system potentially dangerous, an overcharged system will not function properly and can seriously damage your A/C compressor or other component parts. The symptoms of an overcharged A/C system are exactly the same as a system that is undercharged: warm air out of the vents.
    In order to prevent overcharging your A/C system it is imperative to measure the pressure before beginning to charge it. To measure the pressure in the A/C system, attach a pressure gauge to the low side port. Your car must be running with the A/C system set to maximum cool and the fan in its highest setting. It is important to note that the proper pressure in your A/C system is dependent on the ambient (outside) temperature. To determine the proper pressure for your system consult a pressure chart such as this one, or set the bezel arrow on your pressure gauge to the corresponding ambient temperature and charge to the pressure corresponding to that temperature setting. If the outside temperature is at or below 55°F do not charge your car. Also, never charge your vehicle above 55 Psi.
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  4. #4
    Quote Originally Posted by Dave1027 View Post
    I understand replacing the compressor and dyer but why the evaporator? I could be wrong but I believe the entire dash has to come out to replace the evaporator. That's not a job you wanna do on a whim.
    Sorry not the evaporator, the condensor in the front.

    I suspect I found the small leak in the AC system that had me dicking with it in the first place, and I have an excellent source for parts, so it's an overall good deal.

  5. #5
    Join Date
    Feb 2011
    Location
    Deale, MD
    Posts
    1,826
    Also, be sure to replace the o-rings on the fittings when replacing components too, and be careful because they seem to vary a bit in size for different components.

    -Brettski

  6. #6
    Quote Originally Posted by brettbimmer View Post
    Also, be sure to replace the o-rings on the fittings when replacing components too, and be careful because they seem to vary a bit in size for different components.
    Will do. I’ll have the system evacuated, then take care of it at my house, then have the system refilled.

  7. #7
    I replaced the compressor, condenser, and filter thing.

    The entire system was working when I did this, however I did it as a precaution to avoid further problems down the road.

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