Mazda MX-5 NA silhouetteMX-5 NA

AIR CONDITIONER

U-27prose procedure

REFRIGERANT SYSTEM

Safety Precaution

Refrigerant safety precaution

  1. 1
    R-12 liquid refrigerant is highly volatile. A drop of it on the skin could result in localized frostbite. When handling the refrigerant, be sure to wear gloves.
    Personal protective equipment for refrigerant handling. Shows safety goggles on the left and a protective glove on the right.
    9MU0UX-125
  2. 2
    If the refrigerant splashes into the eyes, wash them with clean water immediately. Always wear goggles or glasses to protect the eyes.
  3. 3
    The R-12 container is a highly pressurized vessel. Never subject it to high heat, and be sure that the temperature where it is stored is below 52°C (125.6°F).
    R-12 refrigerant container (small disposable can) shown upright, illustrating the storage-temperature caution.
    05U0UX-060
  4. 4
    A halide leak detector is often used to check an A/C system for refrigerant leakage. Remember that R-12, upon coming into contact with the flame, produces phosgene, a toxic gas. Always provide adequate ventilation.

Basic Procedure of Refrigerant System Service

Refrigerant container service valve

  1. 1
    Turn the handle fully counterclockwise before connecting the valve to the refrigerant container.
    Refrigerant container service valve fitted on top of the R-12 container. The illustration shows the T-handle on top, the outlet valve coupling on the side, and the piercing mechanism at the bottom that mates with the can.
    9MU0UX-127
  2. 2
    Turn the outlet valve counterclockwise until it reaches its highest position.
  3. 3
    Turn the outlet valve fully clockwise by hand. Connect the center hose to the valve fitting.
    Manifold gauge set connected to the refrigerant container service valve via the centre charging hose. Shows the high- and low-pressure gauges on the manifold body with their hand valves, and the small refrigerant can attached at the bottom.
    9MU0UX-128
  4. 4
    Turn the handle clockwise to puncture the sealed can.
  5. 5
    Turn the handle fully counterclockwise to fill the center hose. Do not open the high- or low-pressure manual valves.
  6. 6
    Loosen the hose nut connected to the center fitting of the manifold gauge. Allow air to escape until gas is expelled; then retighten the nut.
    Manifold gauge set with the centre hose nut loosened at the gauge body to expel air from the line. The setup is the same as fig4 with the nut shown being broken loose.
    9MU0UX-129
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