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No.6 Air From Vents Not Cold Enough: Notes

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
AIR FROM VENTS NOT COLD ENOUGH - DESCRIPTION & POSSIBLE CAUSE

Air from vents not cold enough. 
DESCRIPTION 
  • Magnetic clutch operates but A/C system malfunctions.
POSSIBLE CAUSE 
  • Drive belt malfunction (Step 3)
  • Malfunction in blower unit or condenser (Steps 5,6).Malfunction in receiver/drier or expansion valve (valve closes too much) or expansion valve heat-sensing tube installed incorrectly (Steps 9,10)
  • Malfunction in refrigerant lines (Steps 11,12)
  • A/C compressor system malfunction, insufficient compressor oil (Steps 14,15)
  • Too much compressor oil, expansion valve heat-sensing tube installed incorrectly, or malfunction in expansion valve or heater unit air mix link system (Steps 16-19)