Chevrolet Silverado / GMC Sierra. Service manual — part 2311

ACR 2000 recovers, recycles, evacuates and recharges A/C refrigerant quickly, accurately and
automatically. The unit has a display screen that contains the function controls and displays
prompts that will lead the technician through the recover, recycle, evacuate and recharge
operations. R-134a is recovered into and charged out of an internal storage vessel. The ACR
2000 automatically replenishes this vessel from an external source tank in order to maintain a
constant 5.45-6.82 kg (12-15 lbs) of A/C refrigerant.

The ACR 2000 has a built in A/C refrigerant identifier that will test for contamination, prior to
recovery and will notify the technician if there are foreign gases present in the A/C system. If
foreign gases are present, the ACR 2000 will not recover the refrigerant from the A/C system.

The ACR 2000 also features automatic air purge, single pass recycling and an automatic oil drain.

Refer to the J 43600 ACR 2000 manual for operation and setup instruction. See Special Tools.
Always recharge the A/C System with the proper amount of R-134a. Refer to Refrigerant
System Capacities for the correct amount.

A/C Refrigerant System Oil Charge Replenishing

If oil was removed from the A/C system during the recovery process or due to component
replacement, the oil must be replenished. Oil can be injected into a charged system using J
45037 . See Special Tools. For the proper quantities of oil to add to the A/C refrigerant system,
refer to Refrigerant System Capacities.

FLUSHING

Tools Required

J 41447 Leak Detection Dye. See Special Tools.

J 42220 Universal 12V Leak Detection Lamp. See Special Tools.

J 43600 ACR 2000 Refrigerant Station. See Special Tools.

J 45268 Flush Adapter Kit. See Special Tools.

Flush

Flushing is intended to remove the following:

Contaminated PAG oil

IMPORTANT: Flushing is not intended to remove metal from the A/C system.

2008 Chevrolet Silverado 1500

2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Desiccant, following a desiccant bag failure

Overcharge of PAG oil

Refrigerant contamination

1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging.

2. Remove the orifice tube. Refer to Expansion (Orifice) Tube Replacement.

3. Connect the A/C lines with the orifice tube removed.

4. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement

(LY2, LY5, LH6, L76, L92 and LMG) or Air Conditioning Compressor Replacement
(LLY/LMM) or Air Conditioning Compressor Replacement (LU3).

5. Install J 45268 -3 to the A/C compressor hose assembly. See Special Tools.

Fig. 4: View Of A/C Filter And Check Valve
Courtesy of GENERAL MOTORS CORP.

6. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.

Perform the following procedure:

IMPORTANT: Warmer engine or ambient temperature decreases the

refrigerant recovery time during the A/C flush procedure.

IMPORTANT: The filter inside J 45268 -1 is serviceable. See Special

Tools. Remove and discard the check valve from the
filter.

2008 Chevrolet Silverado 1500

2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

1. Service the filter with ACDelco P/N GF 470, before each flush.

Connect J 45268 -1 flush filter to the suction port of the J 45268 -3 flush adapter. See
Special Tools.

2. Connect the blue hose from the J 43600 to J 45268 -1 flush filter adapter. See Special

Tools.

3. Connect the red hose from the J 43600 to J 45268 -3. See Special Tools.

7. Reverse flow refrigerant flushing is recommended for desiccant bag failure only. Perform

the following procedure and replace the accumulator when the flush is complete:

1. Service the filter with ACDelco P/N GF 470, before each flush.

Connect the J 45268-1 flush filter to the discharge port of J 45268 -3 flush adapter.
See Special Tools.

2. Connect the blue hose from J 43600 to J 45268 -1 flush filter adapter. See Special

Tools.

3. Connect the red hose from J 43600 to the suction port of J 45268 -3. See Special

Tools.

8. Flush the A/C system. Follow the instructions supplied with the J 43600 . See Special

Tools.

9. Remove the J 45268 -3 from the A/C compressor hose assembly. See Special Tools.

10. Drain the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in

draining the PAG oil from the compressor.

11. Add back the total system capacity of PAG oil to the A/C compressor. Refer to

IMPORTANT: The filter inside the J 45268-1 is serviceable. Remove

and discard the check valve from the filter.

IMPORTANT: Close the valve on the external refrigerant tank, before

starting the flush process.

IMPORTANT: Flushing will remove all the PAG oil from the A/C system.

The A/C system must be replenished with the correct amount
of PAG oil.

2008 Chevrolet Silverado 1500

2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Refrigerant System Capacities.

12. Add one bottle of J 41447 directly to the A/C Compressor. See Special Tools.

13. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement (LY2,

LY5, LH6, L76, L92 and LMG) or Air Conditioning Compressor Replacement
(LLY/LMM) or Air Conditioning Compressor Replacement (LU3).

14. Inspect the orifice tube for debris. Clean or replace as needed.

15. Install the orifice tube. Refer to Expansion (Orifice) Tube Replacement.

16. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.

17. Leak test the fittings using the J 42220 . See Special Tools.

COMPRESSOR OIL BALANCING

Draining Procedure

1. Before draining oil, position the compressor verdically (clutch facing upwards) and let it sit

for 1 minute.

2. Position the compressor horizontally, with the ports facing downward, rotate the clutch and

shake the compressor in order to remove as much oil from the compressor as possible.

3. Drain the oil from both the suction and discharge ports of the removed compressor into a

clean, graduated container. Rotate the compressor shaft to assist in draining the compressor.

IMPORTANT: Flushing will remove the fluorescent leak detection dye from

the A/C system.

IMPORTANT: Drain and measure as much of the refrigerant oil as possible

from the removed compressor.

2008 Chevrolet Silverado 1500

2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado