problems when turning on AC sound like a blow off value.
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This is a discussion on problems when turning on AC sound like a blow off value. within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I am having a few issues. I usually play my radio kind of loud so I don't know if what ...

  1. #1
    Registered User onekrissy1's Avatar
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    Red face problems when turning on AC sound like a blow off value.

    I am having a few issues. I usually play my radio kind of loud so I don't know if what I am hearing is normal or not. Basically I'm driving with my AC on and while driving the car is making a loud noise kind of like releasing pressure. I had a blow off value before but do not now,but the noise sounds like a blow off value. It is only noticeable when I am running the AC. The car does lose some horse power when it makes this noise. Anyone know what it could be? The turbo or maybe the AC pump? Anyone else have the same trouble. I have a 2005 wrx. Its all stock no performance parts yet.

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    He simply abides. SD_GR's Avatar
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    Has the system ever been opened?

    Does the A/C perform well otherwise?

    Have you ever changed the belts?

    Do you see any smudges or signs of oily residue anywhere along the lines -- check both high side and low side -- or on the fittings where the lines end or on the compressor?
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    Registered User onekrissy1's Avatar
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    Well it works fine beside the loss of power and the noise of the compressor. I took it to my service tech today he suggested getting my AC serviced. Basically drain the freeon and see where the level is compared to where it should be. 16-19 oz.But if that doesn't solve the problem it may be the compressor going bad. The belts are fine and there is no oily smudges or anything out of he ordinary. Now when I'm at a sit still with he hood open turning the AC on and off the compressor does make some noise but nothing like it does when I am driving.

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    Registered User onekrissy1's Avatar
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    Lol I do not know where the AC compressor is located to check by the hoses or the compressor... can u explain where it is located so I can take a look? Thanks!

  6. #5
    Good news, everyone! xxxxxxxAnub1s's Avatar
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    The loss of power from using AC is normal, as is the the sound of the AC system being pressurized by the compressor.
    Cody
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    Your nighttime volunteer of near-useless information.
    Good news, everyone!

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