Quick Checking of Refrigerant Charge
WARNING: This page is about a different car, the 2004 Suzuki Aerio. However, it is still accessible from the selected car via links, so may be relevant.
The following procedure can be used for quickly checking whether the A/C system has a proper charge of refrigerant or not.
Run engine at fast idle, and operate A/C at its maximum cooling capacity for a few minutes.
Then, look at the sight glass (1) on condenser outlet pipe (2) and compare what is observed with the symptoms listed in the table.