Mazda 6 Service Manual: No.22 vibration concerns (engine)

No.21 engine noise

No.23 a/c does not work sufficiently

Other materials:

Mazda 6 Service Manual: Intermittent concern troubleshooting
  Vibration Method 1. If malfunction occurs or becomes worse while driving on a rough road or when engine is vibrating, perform the steps below. Note There are several reasons vehicle or engine vibration could cause an electrical malfunction. Some of the things to check for are: ...

Mazda 6 Service Manual: Specifications
Engine Electrical System *1 Q-85 is designed for i-ELOOP system. Only Q-85 should be used to ensure correct operation of i-ELOOP system. Consult an Authorized Mazda Dealer for details. *2 Not for i-ELOOP system. *3 This spark plug provides the SKYACTIV-G engine with optimum performance. Co ...