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A/C System Performance

WARNING: This page is about a different car, the 1996 Mazda MX-6, 1996 Mazda 626, 1995 Mazda MX-6, and 1995 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect manifold gauge set. Operate engine at 1500 RPM. Operate A/C at maximum cooling. Close front windows and hood. Place thermometers at center vent outlet and blower inlet.
  2. Allow A/C system to stabilize. Ensure blower inlet temperature is 77-95°F (25-35°C), and high pressure is 178-234 psi (12.5-16.5 kg/cm2 ). Record temperatures at center vent outlet and blower inlet.
  3. Calculate difference between blower inlet temperature and center vent outlet temperature. Compare temperature difference to relative humidity. Ensure values are within specified range. See the A/C SYSTEM PERFORMANCE  table.
A/C SYSTEM PERFORMANCE

Temperature °F (°C) (1) Relative Humidity (%)
46-64 (8-18) 50
45-63 (7-17) 60
43-61 (6-16) 70
(1) Difference between blower inlet temperature and center vent outlet temperature.
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