Step | Action | Yes | No | ||||||||||
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DEFINITION: The low side pressure is lower than normal and the high side pressure is higher than normal.
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1 | Were you sent here from the A/C System Performance Test? | Go to Step 2 | |||||||||||
2 |
Caution: Refer to Moving Parts and Hot Surfaces Caution in the Preface section. Feel the liquid line before the expansion device. Is the liquid line cold before the expansion device? | Go to Step 3 | Go to Step 8 | ||||||||||
3 | Feel along the surfaces of the following high side components:
Did you detect an abrupt drop in temperature along the surfaces of any of the listed components? | Go to Step 7 | Go to Step 4 | ||||||||||
4 |
Is the liquid line extremely cold at the expansion device location and warm beyond the expansion device location? | Go to Step 11 | Go to Step 5 | ||||||||||
5 | Feel along the surfaces of the following low side components:
Did you feel an abrupt temperature change along the surfaces of any of the listed components? | Go to Step 7 | Go to Step 6 | ||||||||||
6 | Feel along the surfaces of the low and the high side components:
Are the temperatures of these components only mildly warm? | Go to Step 14 | Go to Step 8 | ||||||||||
7 |
Is the repair complete? | Go to Step 9 | -- | ||||||||||
8 |
Is the weight of the recovered refrigerant charge greater than 75 percent of the total system capacity? | Go to Step 9 | Go to Step 10 | ||||||||||
9 | Recharge the A/C system. Refer to Refrigerant Recovery and Recharging Is the cooling performance improved? | Go to Step 21 | Go to Step 10 | ||||||||||
10 |
Is the repair complete? | Go to Step 21 | -- | ||||||||||
11 | The A/C refrigerant filter or expansion device is restricted.
Are metal flakes present? | Go to Step 12 | Go to Step 13 | ||||||||||
12 |
Did a large amount of debris collect in the shop towel? | Go to Step 18 | Go to Step 20 | ||||||||||
13 | If the expansion device was restricted with a brown or black residue, perform the following procedure:
Are the repairs complete? | Go to Step 21 | -- | ||||||||||
14 |
Is debris present in the compressor suction port? | Go to Step 15 | Go to Step 19 | ||||||||||
15 |
Did you find evidence of damage or debris? | Go to Step 17 | Go to Step 16 | ||||||||||
16 | If the A/C refrigerant filter or expansion device does not show any signs of damage or debris, perform the following procedure:
Did a large amount of debris collect in the shop towel? | Go to Step 18 | Go to Step 19 | ||||||||||
17 |
Are metal flakes present? | Go to Step 12 | Go to Step 13 | ||||||||||
18 | If a large amount of debris was collected in the shop towel from the suction hose, perform the following procedure:
Is the repair complete? | Go to Step 19 | -- | ||||||||||
19 |
Are the repairs complete? | Go to Step 21 | -- | ||||||||||
20 |
Are the repairs complete? | Go to Step 21 | -- | ||||||||||
21 |
Are the readings within the specified ranges as shown on the A/C Performance Chart? | Go to Step 22 | |||||||||||
22 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK |