A/C System Performance Inspection - Suzuki Grand Vitara 2011 Manual

7B-25 Air Conditioning System:

A/C System Performance Inspection

1) Confirm that vehicle and environmental conditions
are as follows.
• Vehicle is put indoors.
• Ambient air temperature is within 15 – 35 °C (59 –
95 °F).
• Relative humidity is within 30 – 70%.
• There is no wind indoors.
• HVAC unit is normal condition.
• There is no air leakage from air ducts.
• Condenser fins are clean.
• HVAC air filter is not clogged with dirt and dust.
• Battery voltage is 12 V or more.
• Radiator cooling fan operates normally.
2) Make sure that high pressure valve (1) and low
pressure valve (2) of manifold gauge (3) are firmly
closed.
3) Connect high pressure charging hose (4) to high
pressure service valve (5) on vehicle, and connect
low pressure charging hose (6) to low pressure
service valve (7) on vehicle.
4) Bleed the air in charging hoses by loosening their
respective nuts on manifold gauge, utilizing the
refrigerant pressure. When a hiss is heard,
immediately tighten nut.
WARNING
!
Make sure to connect high and low pressure
charging hoses to correct valves. Connecting
them in the other way around may cause
charging hoses and refrigerant container to
burst.
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5) Warm up engine to normal operating temperature
(engine coolant temperature at 80 – 90 °C (176 –
194 °F)) and keep it at specified idle speed.
6) Operate A/C at the following conditions.
• A/C switch at ON position
• Blower speed selector at max position
• Air flow selector at "VENT" position
• Temperature selector at max cool position
• Vehicle door at all open
• Air inlet door at recirculation position
7) Wait for ten minutes to stabilize A/C operation.
8) Keep all windows, front doors and engine hood
open.
9) With about 20 mm (0.8 in.) of dry bulb thermometer
(1) put right in front of center ventilation louver and a
wet and dry bulb thermometer (2) near air inlet (3) of
HVAC unit.
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