Suzuki XL7 2007 Service Manual page 1890

7A-76 Heating, Ventilation and Air Conditioning:
Step
Increase engine speed to 2,000 RPM.
During extended operation of the A/C system, does the
4 low side pressure decrease, possibly accompanied by
heavy frost on the liquid line between the expansion
device and the evaporator?
1. Refer to the pressures recorded during the A/C
system performance test.
2. Inspect for the following conditions:
WARNING
!
Refer to "Moving Parts and Hot Surfaces
Caution: " in Cautions and Notices.
– The high side pressure is slightly greater than the
5
specified pressure ranges but still within Zone A
on the A/C Pressure-Zone Classification Chart in
the A/C System Performance Test. Refer to "Air
Conditioning (A/C) System Performance Test (w/
C69)" "Air Conditioning (A/C) System
Performance Test (w/o C69)".
– The discharge line is hot.
– The suction line is cool.
Do the listed conditions exist?
1. Refer to the pressures recorded during the A/C
system performance test.
2. Inspect for the following conditions:
– The low side pressure is slightly lower than the
specified pressure ranges but still within Zone A
on the A/C Pressure-Zone Classification Chart in
6 the A/C System Performance Test. Refer to "Air
Conditioning (A/C) System Performance Test (w/
C69)" "Air Conditioning (A/C) System
Performance Test (w/o C69)".
– The discharge line is warm to hot.
– The suction line is cool to warm.
Do the listed conditions exist?
The A/C system may be undercharged.
1. Leak test A/C system. Refer to "Leak Testing".
7
2. Recharge the A/C system to specifications. Refer to
"Refrigerant Recovery and Recharging".
Is the action complete?
The A/C system may be contaminated.
View the information screen on J 43600 for detection of
8
foreign gases in the A/C system.
Do foreign gases exist?
1. Evacuate the A/C system to a scavenging tank.
Refer to "Refrigerant Recovery and Recharging".
9
2. Recharge the A/C system to specifications.
Is the action complete?
Action Value Yes
Go to "Air
Conditioning (A/
— C) Diagnostics -
Pressure Zone
D"
— Go to Step 7
— Go to Step 8
— Go to Step 14
— Go to Step 9
— Go to Step 14
No
Go to Step 5
Go to Step 6
Go to "Too Hot in
Vehicle"
—
Go to Step 10
—