Mazda 6 Service Manual: No.23 a/c does not work sufficiently

No.22 vibration concerns (engine)

No.24 a/c is always on or a/c compressor runs continuously

Other materials:

Mazda 6 Service Manual: Engine control system operation inspection
Main Relay Operation Inspection Verify that the main relay clicks when the ignition switch is turned to ON position and off. If there is no operation sound, inspect the following. - Main relay (See RELAY INSPECTION.) - Harness and connector between ignition switch and main relay termi ...

Mazda 6 Service Manual: Clutch fluid replacement
Caution Be careful not to spill clutch fluid on a painted surface. If this should happen, wash it off immediately. Note Do not mix different brands of clutch fluid. Do not reuse the clutch fluid that was drained out. 1. Remove the under cover. 2. Draw the fluid from the reservoir ...