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Chevrolet Silverado / GMC Sierra. Manual - part 2306
3
The liquid line between the condenser and
the expansion device
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
1. Feel the liquid line at the expansion device
location for extreme cold, possibly
accompanied by heavy frost.
2. Feel along the liquid line beyond the
expansion device location for warm
temperature.
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:
The evaporator inlet tube between the
expansion device and the evaporator core
The evaporator outlet tube between the
evaporator core and the compressor
The accumulator
The compressor suction hose
Did you feel an abrupt temperature change
along the surfaces of any of the listed
components?
Go to Step 7
Go to Step 6
Feel along the surfaces of the low and the high
side components:
The evaporator inlet tube between the
expansion device and the evaporator core
The evaporator outlet tube between the
evaporator core and the accumulator
2008 Chevrolet Silverado 1500
2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
6
The accumulator
The compressor suction hose
The compressor discharge hose
The condenser
The evaporator inlet tube between the
condenser and the expansion device
Are the temperatures of these components only
mildly warm?
Go to Step 14
Go to Step 8
7
1. Recover the refrigerant. Refer to
Refrigerant Recovery and Recharging.
2. Remove the restriction from the
component, or replace the component
which produced an abrupt temperature
drop.
Is the repair complete?
Go to Step 9
-
8
1. Recover the refrigerant and evacuate the
system. Refer to Refrigerant Recovery
and Recharging.
2. Record the weight of the recovered
refrigerant.
3. Compare the weight of the recovered
refrigerant with the system capacity. Refer
to Refrigerant System Capacities.
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
1. Leak test the system. Refer to Leak
Testing.
2. Repair any leaks.
2008 Chevrolet Silverado 1500
2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Is the repair complete?
Go to Step 21
-
11
The expansion device is restricted.
Replace the expansion device. Refer to
Expansion (Orifice) Tube Replacement.
Are metal flakes present?
Go to Step 12
Go to Step 13
12
1. Remove the suction line from the vehicle.
Refer to Suction Hose Replacement
(LY2, LMF, L76 and L92) or Suction
Hose Replacement (LMM).
2. Inspect the hose for debris by blowing
shop air through one end of the hose while
covering the other end with a shop towel.
3. Observe the amount of debris collected in
the shop towel.
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:
1. Flush the A/C system. Refer to Flushing.
2. Replace the accumulator. Refer to Air
Conditioning Accumulator
Replacement (Non-HP2).
Are the repairs complete?
Go to Step 21
-
14
1. Recover the refrigerant. Refer to
Refrigerant Recovery and Recharging.
2. Disconnect the suction and the discharge
lines from the compressor. Refer to
Suction Hose Replacement (LY2,
LMF, L76 and L92) or Suction Hose
Replacement (LMM) and Discharge
Hose Replacement (LY2, LMF, L76
and L92) or Discharge Hose
Replacement (LMM).
2008 Chevrolet Silverado 1500
2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
3. Inspect for the presence of debris in the
compressor suction port.
Is debris present in the compressor suction port? Go to Step 15
Go to Step 19
15
1. Remove the debris from the suction port.
2. Inspect the expansion device for damage
or debris. Refer to Expansion (Orifice)
Tube Replacement.
Did you find evidence of damage or debris?
Go to Step 17
Go to Step 16
16
If the expansion device does not show any signs
of damage or debris, perform the following
procedure:
1. Remove the suction line from the vehicle.
Refer to Suction Hose Replacement
(LY2, LMF, L76 and L92) or Suction
Hose Replacement (LMM).
2. Inspect the hose for debris by blowing
shop air through one end of the hose while
covering the other end with a shop towel.
3. Observe the amount of debris collected in
the shop towel.
Did a large amount of debris collect in the shop
towel?
Go to Step 18
Go to Step 19
17
1. Replace the expansion device. Refer to
Expansion (Orifice) Tube
Replacement.
2. If the expansion device was restricted,
observe the type of debris present.
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 compressor hose assembly,
perform the following procedure:
Replace the accumulator. Refer to Air
2008 Chevrolet Silverado 1500
2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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