Ford Transit 2002 Owner's Manual page 1465

Operation).
Refrigerant circuit check
WARNING: Under certain circumstances, refrigerant lines and A/C components may
be extremely hot or cold. Exercising care, touch the refrigerant lines or A/C components
in order to check this. Failure to observe this instruction can lead to injury.
When the A/C system is operating, the following conditions should apply:
The refrigerant line from the A/C compressor to the A/C condenser must be hot.
The refrigerant line from the A/C condenser to the fixed orifice tube must be warm, but
not so hot as the refrigerant line mentioned above.
Determine the difference in temperature upstream and downstream of the A/C condenser
by measuring the temperatures. Depending on the ambient temperature, the
temperature difference should be more than 20°. If the temperature difference is less,
check the condenser for contamination or damage to the fins as well as operation of the
radiator fan.
The refrigerant line between the fixed orifice tube and the evaporator must be cold from
the point where the fixed orifice tube is installed. Depending on the weather, the
refrigerant line may also have ice on its surface.
The refrigerant line between the evaporator and the A/C compressor including the
refrigerant accumulator must be cold.
Evaporator outlet temperature test
To test the power of the A/C system, the temperature of the evaporator outlet line must be
measured. To do this, the following preconditions must be met:
Open all windows.
Set the air distribution to the defrost/dashboard position and open all the ventilation
nozzles.
DO NOT switch on recirculated air.
Select lowest blower switch setting.
Select lowest temperature setting.
NOTE: The temperature measurement cannot be done with a thermometer which makes
no contact. The surface reflection from the metal line may cause incorrect readings.
Connect the temperature sensor (Fluke 80 PK-8) to the outlet line of the evaporator. The
temperature sensor must be positioned as closely as possible to the evaporator. Connect
the temperature sensor to the multimeter.
Start the engine and allow it to idle.
Switch on the air-conditioning system.
After three minutes, measure the surface temperature of the evaporator outlet line.
If the temperature measured is 2° C or less, the A/C system is working correctly. If the
temperature is higher, the A/C system may be under-filled. For further information, refer to
REFER to: (412-00 Climate Control System - General Information)
Specifications (Specifications),
Air Conditioning (A/C) System Recovery, Evacuation and Charging
Frequent faults and their causes
If the cooling power of the A/C system is not adequate, make certain that the temperature
control flaps are operating correctly.
No or poor cooling performance:
- Blockage or restriction in one of the refrigerant lines or in the suction accumulator. By
comparing temperatures at the refrigerant lines or at the suction accumulator, the
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(General Procedures).