Tuesday, June 14, 2011

Air Conditioning System testing for Dodge Durango ?

A/C Performance Test

This procedure requires the technician to know what the actual relative humidity is for the time and day of the test. This information can be obtained from multiple sources, such as the internet or local news media.

  1. Make sure the following conditions are met in the area where the test is to be performed:
    When connecting service equipment couplings to the line fittings, verify that the valves of the couplings are fully closed prior to installation. This will reduce the amount of effort required to make the connection.

    Maximum ambient temperature: 10°F (43.3°C)
    Minimum ambient temperature: 60°F (15.5°C)
    Minimum relative humidity: 20 percent
    Maximum relative humidity: 90 percent

  2. Connect a manifold gauge set or an A/C recycling/charging station.
  3. Operate the heating-A/C system under the following conditions:

    Engine at normal operating temperature
    Engine at normal idle speed
    No sun-load in the cabin of the vehicle
    Vehicle doors and windows closed
    Transmission in Park
    A/C-heater controls set to Recirculation mode, full cool, panel mode, high blower and with A/C compressor engaged.
    All panel outlet vanes open and positioned straight rearward

  4. Using a scan tool, manually close the high speed cooling fan relay. If this step is not performed, the test results will not be accurate.
  5. Insert a thermometer in the driver side center panel air outlet and operate the A/C system until the thermometer temperature stabilizes or a minimum of 5 minutes.
    The compressor clutch may cycle while performing this test, depending upon the ambient temperature and humidity. If the clutch cycles, use the readings obtained before the clutch disengaged.

  6. With the A/C compressor clutch engaged, compare the observed panel outlet air temperature along with the ambient temperature of the work area and the relative humidity to the Maximum Panel Outlet Temperature chart.

    Click image to see an enlarged view

    Fig. Maximum panel outlet temperature chart.

System Service Equipment

Eye protection must be worn when servicing an air conditioning refrigerant system. Turn off (rotate clockwise) all valves on the equipment being used before connecting to, or disconnecting from the refrigerant system. Failure to observe these warnings may result in personal injury or death.

Review all precautions in the front of this section before performing the following operation.

Manifold Gauge Set

Never use an R-12 manifold gauge set on an R-134a system. The refrigerants are not compatible and system damage will result.

  1. A manifold gauge set may be needed with some recovery/recycling/charging equipment. The manifold gauge set should have manual shut-off valves, or automatic back-flow valves located at the service port connector end of the manifold gauge set hoses. This will prevent refrigerant from being released into the atmosphere.

Manifold Gauge Set Connections

Do not use an R-12 manifold gauge set on an R-134a system. The refrigerants are not compatible and system damage will result.

LOW PRESSURE GAUGE HOSE - The low pressure hose (Blue with Black stripe) attaches to the suction (low side) service port. This port is on the A/C suction line located near the A/C expansion valve at the rear of the engine compartment.

HIGH PRESSURE GAUGE HOSE - The high pressure hose (Red with Black stripe) attaches to the discharge (high side) service port. This port is on the liquid line fitting located at the top of the receiver/drier near the right strut tower.

RECOVERY, RECYCLING, EVACUATION AND CHARGING HOSE - The center manifold hose (Yellow, or White, with Black stripe) is used to recover, evacuate, and charge the refrigerant system. When the low or high pressure valves on the manifold gauge set are opened, the refrigerant in the system will escape through this hose.

Click image to see an enlarged view

Fig. Typical manifold gauge set: high pressure gauge (1), valve (2), vacuum/refrigerant hose (3), high pressure hose (4), low pressure hose (5), valve (6) and low pressure gauge (7)

Recovery/Recycling Station

When servicing the A/C system, an R-134a refrigerant recovery/recycling/charging station that meets SAE standard J2210 must be used. Contact an automotive service equipment supplier for refrigerant recovery/recycling/charging equipment. Refer to the operating instructions supplied by the equipment manufacturer for proper care and use of this equipment.

Click image to see an enlarged view

Fig. Typical A/C refrigerant recovery/recycling/charging station (1)

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