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Air Conditioner Selection, Issue #013 -- Auto ACs' First Culprit
January 19, 2007

19 January 2007

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Table of contents

  1. Content Highlight on Air Conditioner Selection - How To Solder

  2. Your ninth tip. Tip #0009: Auto ACs' First Culprit

1. Content Highlight on Air Conditioner Selection - How to Solder

Soldering is widely used in fixed air conditioning industry, where copper tubes are used.

Its purpose, is to join tubes, to form a closed loop, and leak free air conditioning system.

So, much care is to be taken before, during, and after soldering.

Here is an ordered list of activities to do, for a good soldering:

  1. Knowing the most practical tube route,

  2. Cutting the tubes to length,

  3. Bend tubes where necessary,

  4. Expand one end of mating tubes,

  5. Clean ends of the joining sections,

  6. Apply flux to the joining sections,

  7. Fit mating sections,

  8. Put necessary fire protection blanket or barrier for soldering activities,

  9. Ignite torch and heat joined sections for about 10 seconds,

  10. Put tip of solder material at the interference of joining sections, and let the solder flow,

  11. Remove solder material, and clean with cotton rag immediately

  12. Simple as it may sound, these activities should be trained, and supervised by a competent person before you can comfortably do it yourself.

    All the best.

    How to Solder page

    2. Your ninth tip. Tip #0009: Auto ACs' First Culprit

    I have heard it many times, and I have experienced it myself, a couple of times.

    The first culprit of automotive air conditioner's bad performance.

    It is the condenser, or radiator fans.

    And the problem will normally occur at the relay, fuses and wiring, and in some cases - the motor itself.

    Here is how you can pin point that the condenser fan is not working.

    Your AC will blow cool air while your vehicle is in motion, and the performance will drop by a large difference, once you are stuck in a traffic jam, or at a traffic light.

    The reason?

    A defective fan, will not cool down the compressed refrigerant from compressor, and there won't be enough liquid for evaporation at the cooling coil.

    However, when the car is in motion, air stream will cool down the condenser, and take up the role of the fan.

    How to confirm the problem?

    Start the engine, turn on the AC and put it on a low temperature.

    Then, observe if the condenser (or radiator) fan is rotating, or not.

    Some cars require you to open the engine bay's hood to observe the fan, and some can be viewed from the front grille.

    If it is not rotating, then the problem is either on the relay, fuse, connection, or the motor itself.

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    All the best and we'll meet again in the next issue!


    MJK Nurul Amin,
    "Be comfortable"
    Chief Editor,

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