Mazda 6 Service Manual: No.20 noise occurs at idle when vehicle is stopped in all positions/ranges

No.19 excessive shift shock on torque converter clutch (tcc)

No.21 noise occurs at idle when vehicle is stopped in d, s, l ranges, or in r position

Other materials:

Mazda 6 Service Manual: Instrument cluster removal/installation
Caution When replacing the instrument cluster, the configuration procedure must be performed before removing the instrument cluster. If the configuration procedure is not performed before removing the instrument cluster, it is possible that the instrument cluster will not operate normally. ...

Mazda 6 Service Manual: Water pump
1. Disconnect the negative battery cable. 2. Drain the engine coolant. (See COOLING SYSTEM SERVICE WARNINGS.) (See ENGINE COOLANT REPLACEMENT.) 3. Loosen the water pump pulley bolt to remove the drive belt. (See DRIVE BELT REPLACEMENT.) 4. Remove in the order indicated in the table. 5. Insta ...