| | Results of the tests |
| 1 | SYSTEM OPERATION CHECK | All OK | Problems met | Operation |
|---|
| Check
that the system cooling is correct: See Test 5040A Checking operation of air conditioner (temperature) | Continue to Step 2 | The temperature decreases
very slowly: insufficient fluid: | Re-pressurize the system: Op. 5040A10 |
| 2 | SYSTEM PRESSURE CHECK | All OK | Problems met | Operation |
|---|
| Check
the system pressure: See Test 5040B Check on operation of air conditioning system (pressures) | Continue to Step 3 | High pressure does not
increase or low pressure decreases too much: leaks in the circuit | Locate the leaks Op. 5040A14 |
| High pressure correct, low pressure very high | Replace the expansion valve Op. 5040B30 |
| High pressure high, low pressure below normal | Clean or replace the drier filter Op. 5040A44 |
| Pressure trends irregular: pipes obstructed | Wash the system, see Op. 5040A10 |
| Pressure trends irregular: evaporator obstructed. | Replace the evaporator: Op. 5040C64 |
| 3 | CONDENSER CHECK | All OK | Problems met | Operation |
|---|
| Visually
inspect the condition of the condenser: the heat exchange surface
should not be dirty or fouled | Continue to Step 4 | Condenser dirty | Clean the condenser if necessary,
replace it: Op. 5040A40 |
| 4 | CHECKING CORRECT OPERATION | All OK | Problems met | Operation |
|---|
| Check
that the fault is no longer present | End of diagnosis | Fault persists | Search for the
fault starting from another symptom' |