Sierra 3500 4WD V8-6.6L DSL Turbo VIN 2 (2004)
the pressure at which the switch opens/closes is imperative to successfully diagnosing the switch.
7.
If the A/C performance has not improved after performing the above steps, replace the accumulator with P/N 89018601, using the procedure listed
below. This new accumulator also requires the accumulator bracket, accumulator insulator and A/C suction hose to be replaced.
Accumulator Replacement
1.
Remove the suction hose mounting bolt from the A/C compressor.
2.
Remove the suction hose from the compressor.
3.
Remove the suction hose nut from the accumulator.
4.
Remove the suction hose from the accumulator.
5.
Remove the evaporator tube nut from the evaporator.
6.
Remove the evaporator tube from the evaporator.
7.
Disconnect the electrical connector from the A/C low pressure switch.
8.
Remove the nut from the evaporator fitting.
9.
Remove the accumulator bracket nut from the retaining stud.
10.
Remove the accumulator.
11.
Remove the retaining bracket bolt. This bolt must be reused for the new bracket.
12.
Remove the insulator. One half of the insulator must be reused.
13.
Install the new insulator and one half of the old insulator onto the new accumulator.
14.
Install the new retaining bracket and bolt to the accumulator. Do not tighten at this time.
15.
Add the PAG oil directly into the new accumulator that was removed during the recovery process plus an additional 90 ml (3 oz).
16.
Install the new accumulator.
17.
Install the accumulator bracket nut.
Tighten
Tighten the nut to 9 N.m (80 lb in).
18.
Tighten the retaining bracket bolt.
Tighten
Tighten the nut to 10 N.m (89 lb in).
19.
Install the nut to the evaporator fitting.
Tighten
Tighten the nut to 16 N.m (12 lb ft).
20.
Install the evaporator tube to the evaporator.
21.
Install the evaporator tube nut to the evaporator.
Tighten
Tighten the nut to 16 N.m (12 lb ft).
22.
Install the new suction hose to the accumulator.
