Suzuki XL7 2007 Service Manual page 1896

7A-82 Heating, Ventilation and Air Conditioning:
Air Conditioning (A/C) Diagnostics - Pressure Zone D
Step
DEFINITION: The low side pressure is lower than normal and the high side pressure is higher than normal.
• A restriction in the Air Conditioning (A/C) system
• Debris in the system
Were you sent here from the air conditioning (A/C) System
Performance Test?
1
WARNING
!
Refer to "Moving Parts and Hot Surfaces Caution:
".
2
Feel the liquid line before the thermal expansion valve (TXV).
Is the liquid line cold before the TXV?
Feel along the surfaces of the following high side components:
• The compressor hose between the compressor and the
condenser
3
• The condenser
• The liquid line between the condenser and the TXV
Did you detect an abrupt drop in temperature along the
surfaces of any of the listed components?
1. Feel the liquid line at the TXV location for extreme cold,
possibly accompanied by heavy frost.
2. Feel along the liquid line beyond the TXV location for
4
warm temperature.
Is the liquid line extremely cold at the TXV location and warm
beyond the TXV location?
Feel along the surfaces of the following low side components:
• The evaporator inlet tube between the TXV and the
evaporator core
• The evaporator outlet tube between the evaporator core
5
and the compressor suction hose
• The compressor suction hose
Did you feel an abrupt temperature change along the surfaces
of any of the listed components?
Feel along the surfaces of the low and the high side
components.
• The evaporator inlet tube between the TXV and the
evaporator core
• The evaporator outlet hose between the TXV and the
6
compressor
• The compressor hose assembly
• The condenser
• The liquid line between the condenser and the TXV
Are the temperatures of these components only mildly warm?
1. Recover the refrigerant. Refer to "Refrigerant Recovery
and Recharging".
7
2. Remove the restriction from the component, or replace the
component which produced an abrupt temperature drop.
Is the action complete?
Action Yes
Conditioning (A/C)
System Performance
Go to Step 2 Test (w/ C69)" "Air
Conditioning (A/C)
System Performance
Test (w/o C69)"
Go to Step 3 Go to Step 8
Go to Step 7 Go to Step 4
Go to Step 11 Go to Step 5
Go to Step 7 Go to Step 6
Go to Step 14 Go to Step 8
Go to Step 9
No
Go to "Air
—