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2004 Honda CRV with new compressor

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  • 2004 Honda CRV with new compressor

    All,
    I just changed a compressor on a 2004 Honda CRV. After hooking everything up, I used a vacuum pump to draw out all moisture, and air inside the system. Left the vacuum on for at least 45 minutes. Came back, saw the low side at -30 which means it was good to go. Turned off the vacuum pump, High side turned off, then put in a can of R134a. Seemed that it took the can which the needed on the low side came back at 30. Started up the car, turned on the AC, clutch engaged, but no cold air. Stopped the car and left the low side on and the needed was reading very high. High side was very low. This points to the compressor again. Could this be?!?!? HELP!

    Thanks

  • #2
    Welcome Blade: Lots of info needed 1st what happened that you replaced compressor at all?

    What oil was in old unit and how much came out plus how much refrigerant did you add? It's not just a "fill 'er up" deal rather a whole procedure of exact amounts to a known ounce listed under the hood.

    No cool air is no surprise yet. System off with any refrigerant in it you are just reading static pressure. Doesn't take much to get a reading.

    Just FYI, A/C isn't DIY friendly if you don't diagnose first, fix and replace parts as needed then follow exact procedures for charging up a system to know amount is correct at least both refrigerant and oil.

    Beware - one mistake in diagnosing you needed this at all done wrong it would probably fail right away and need more than before you tried. It's unforgiving and costly.
    There's not enough info yet about this yet to proceed yet on this,
    Tom
    MetroWest, Boston

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    • #3
      The hardest thing to get across to anyone is that pressures indicate one thing and one thing only! The temp of the refrigerant at the point of phase change from gas to liquid (high side) and from liquid to gas (low side) . Everything else is guess work based on what should be happening if the system is charged and working properly.
      With the system at rest and enough refrigerant in the system, the static pressure will equate to the ambient temp of the system, so with the engine bay cold, it will equate to air temp.
      If a system has been properly charged by weight, and has enough oil and air flow across the heat exchangers, and the RPM is fast enough so the compressor is pumping enough CFM's. The Pressures read will give some indication of what is going on based on what the condensing temp and boiling temp of the refrigerant is.
      Refrigeration compressors very rarely "wear out" most fail from lack of lubrication or are replaced due to a seal leak or clutch failure. Think about it, no combustion or soot like in an engine, bathed in oil (no oil control rings) once in operation the incoming gas and oil is near 32 deg and the out going isn't extremely hot
      We need more info, like why you changed the compressor? .

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