A/C System Performance Inspection: Notes
WARNING: This page is about a different car, the 2007 Suzuki Grand Vitara and 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
- Are filter is not clogged with dirt and dust.
- Battery voltage is 12 V or more.
- Radiator cooling fan operates normally.
- Make sure that high pressure valve (1) and low pressure valve (2) of manifold gauge (3) are firmly closed.
- 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.
- 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. - Warm up engine to normal operating temperature (engine coolant temperature at 80 - 90°C (176 - 194°F)) and keep it at specified idle speed.
- 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
- Wait for ten minutes to stabilize A/C operation.
- Keep all windows, doors and engine food open.
- 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.
- Check for each pressure of low side and high side if it is within shaded range of graph. If each gauge reading is out of specified pressure, correct defective part referring to the table.
Low side and high side pressure example, gauges should read as follows when ambient temperature is 30°C (86°F)
Pressure on high pressure gauge (HI): 1340 - 1670 kPa (13.4 - 16.7 kg/cm 2 , 191 - 237 psi)
Pressure on high pressure gauge (LO): 280 - 390 kPa (2.8 - 3.9 kg/cm 2 , 40 - 55 psi)
NOTE: Pressure registered on gauge varies with ambient temperature. Therefore, use the graphs when determining if pressures are normal or not.