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Do i need to flush a/c lines after changing a/c hose assembly?

Do i need to flush a/c lines after changing compressor and a/c hose assembbly

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  • Ford Master
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Yes. There will be left over metal particles in the system. Flushing removes all the oil in the system too so don't forget to add the correct amount before starting the compressor when adding freon.

Posted on Mar 23, 2014

Testimonial: "Thanks, the orifice tube was completely clogged when i pulled it out, looks like the compressor really did a number when it failed. Should i replace the accumulator also? I have the lines to the front and rear evaporators and the condenser isolated and plan to flush all three. Does it matter which direction to flush?"

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  • Lawrence Oravetz Mar 25, 2014

    Replace the accumulator after you have flushed the system. If you flush the system with the hoses in place the sludge will be caught iby the dissicant in the accumulator/drier. Push the flush thru the evaporator first. You absolutely have to evacuate the system for an hour or so just prior to adding freon to make sure all the air has been removed. If you try to cheat on this the system will not perform correctly.

  • amateur mechanic
    amateur mechanic Mar 28, 2014

    Yea, the rear evap was really dirty. The compressor lines run to the accumulator ant then to the rear evaporator which explains it being so bad. The front cabin evap and condenser was relitivly clean. Flushed all three and blew air until dry. The specs call for 56oz of freon and 14 oz of Pac 46 oil. How should i add the oil. Can i buy a container of oil and add the system is evacuated or do i add it with the freon?

  • Lawrence Oravetz Mar 29, 2014

    Once the system is closed and evacuated you put the oil in first on the low side.You don't want the shaft seal on the compressor to start dry. You can get oil in cans that connect to the gauges like a freon can does. They are smaller and may contain a dye that will show at any point there is a leak. If you have more oil left in the can that may be an oz more than necessary put the whole can in. Once that is done put one can of freon in the low side. this will pressurize the system enough to engage the clutch safety switches . Add more until the clutch engages then finish off the charge. Open all the car doors when you're charging so the thermostat won't stop the clutch before the charge is complete. It just makes it go faster.

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