K 1500 Truck 4WD V8-4.8L VIN V (2003)
before servicing.
6.
Install the J 43600 ACR 2000 Air Conditioning Service Center.
Important:
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The ambient temperature must be at least 16°C (60°F).
^
Do not induce additional air flow across the front of the vehicle during the test.
7.
Record the ambient temperature displayed on the J 43600.
8.
Record readings of the low and high side STATIC pressures. The pressures should be within the specifications listed below.
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Above 16°C (60°F): 345 kPa (50 psi)
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Above 24°C (75°F): 483 kPa (70 psi)
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Above 33°C (90°F): 690 kPa (100 psi)
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If the static pressures are within specification, continue with Step 12.
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If the static pressures are NOT within specifications, refer to Leak Testing (SI Document ID # 1141201).
9.
Apply the parking brake.
10.
Place the transaxle/transmission in PARK.
11.
Start the engine.
12.
Turn on the A/C system.
13.
Inspect the A/C compressor to see if it is operating properly.
14.
If the compressor is not operating as designed, tap on the low pressure cycling switch (2) with a small hand tool. The compressor should start
operating correctly.
15.
If the compressor does not operate correctly after tapping on the low pressure cycling switch (2), disconnect the switch and jumper the lower
pressure cycling switch connector with a fused jumper. If the compressor still does not operate properly, refer to HVAC Compressor Clutch Does
Not Engage diagnostic in SI.
Important:
DO NOT USE A/C low pressure cycling switch, P/N 15035084 on the vehicles listed above.
16.
If the compressor does operate correctly after tapping on the switch or jumping the low pressure cycling switch connector, replace the low pressure
cycling switch (2), P/N 89040362. Refer to Air Conditioning (A/C) Low Pressure Switch Replacement in SI.
17.
Perform the Air Conditioning (A/C) System Performance Test in SI.
