Ram Truck 1500, 2500 & 3500 (2006-2008)

Charging the System

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CAUTION
Refer to the applicable precautions for this system before performing the following operation. Failure to follow the warnings and cautions could result in possible personal injury or death.


NOTE
Always refer to the under hood HVAC Specification Label for the refrigerant fill specification of the vehicle being serviced.

After all refrigerant system leaks have been repaired and the refrigerant system has been evacuated, a refrigerant charge can be injected into the system. For the proper amount of the refrigerant charge, refer to the under hood HVAC Specification Label.


NOTE
A R-134a refrigerant recovery/recycling/charging station that meets SAE Standard J2210 must be used to charge the refrigerant system with R-134a refrigerant. Refer to the operating instructions supplied by the equipment manufacturer for proper care and use of this equipment.


WARNING
A small amount of refrigerant oil is removed from the A/C system each time the refrigerant system is recovered and evacuated. Before charging the A/C system, you MUST replenish any oil lost during the recovery process. Refer the equipment manufacturer instructions for more information.

  1. Evacuate the refrigerant system as outlined in this section.
  2.  
  3. A manifold gauge set and an R-134a refrigerant recovery/recycling/charging station that meets SAE standard J2210 should be connected to the refrigerant system.
  4.  
  5. Measure the proper amount of refrigerant and heat it to 125°F (52°C) with the charging station. See the operating instructions supplied by the equipment manufacturer for proper use of this equipment.
  6.  
  7. Open both the suction and discharge valves, then open the charge valve to allow the heated refrigerant to flow into the system.
  8.  
  9. When the transfer of refrigerant has stopped, close both the suction and discharge valves.
  10.  
  11. If all of the refrigerant charge did not transfer from the dispensing device, open all of the windows in the vehicle and set the heating-A/C system controls so that the A/C compressor is engaged and the blower motor is operating at its lowest speed setting. Run the engine at a steady high idle (about 1400 rpm). If the A/C compressor does not engage, test the compressor clutch control circuit and repair as required. Open the low-side valve to allow the remaining refrigerant to transfer to the refrigerant system.
    CAUTION
    Take care NOT to open the discharge (high pressure) valve at this time. Failure to follow this warning could result in possible personal injury or death.

  12.  
  13. Disconnect the charging station and manifold gauge set from the refrigerant system service ports.
  14.  
  15. Reinstall the caps onto the refrigerant system service ports.
  16.  

System Service Equipment




CAUTION
Eye protection MUST be worn when servicing an A/C refrigerant system. Turn all valves off (rotate clockwise) on the equipment being used before connecting or disconnecting service equipment from the refrigerant system. Failure to observe these warnings may result in personal injury or death.


CAUTION
Refer to the applicable precautions for this system before performing the following operation. Failure to follow the warnings and cautions could result in possible personal injury or death.

When servicing the A/C system, a R-134a refrigerant recovery/recycling/charging station that meets SAE standard J2210 must be used (1). 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.

A manifold gauge set (1) may be needed with some recovery/recycling/charging equipment. The manifold gauge set should have manual shut-off valves (2 and 6), or automatic back-flow valves located at the service port connector end of the manifold gauge set hoses (4 and 5). This will prevent refrigerant from being released into the atmosphere.

Click image to see an enlarged view

Fig. An R-134a refrigerant recovery/recycling/charging station (1) that meets SAE standard J2210 must be used to recover the refrigerant from the R-134a refrigerant system. Refer to the operating instructions supplied by the equipment manufacturer for the proper care and use of this equipment



Click image to see an enlarged view

Fig. A manifold gauge set (1) may be needed with some recovery/recycling/charging equipment. The manifold gauge set should have manual shut-off valves (2 and 6), or automatic back-flow valves located at the service port connector end of the manifold gauge set hoses (4 and 5). This will prevent refrigerant from being released into the atmosphere.

Manifold Gauge Set Connections

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

RECOVERY/RECYCLING/EVACUATION/CHARGING HOSE- The center manifold hose (Yellow, or White, with Black stripe) (3) 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.

HIGH PRESSURE GAUGE HOSE - The high pressure hose (Red with Black stripe) (4) attaches to the high side service port. This service port is located on the A/C liquid line next to the left shock tower. On this model, an A/C pressure transducer is also installed on the liquid line. A/C high-side pressures can be read using a scan tool. Refer to 9 - Engine Electrical Diagnostics for more information.

LOW PRESSURE GAUGE HOSE - The low pressure hose (Blue with Black stripe) (5) attaches to the low side service port. This service port is located on the A/C suction line behind the left shock tower.

Click image to see an enlarged view

Fig. A manifold gauge set (1) may be needed with some recovery/recycling/charging equipment. The manifold gauge set should have manual shut-off valves (2 and 6), or automatic back-flow valves located at the service port connector end of the manifold gauge set hoses (4 and 5). This will prevent refrigerant from being released into the atmosphere.

 
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