I have a 1988 Mazda 323 Automatic with M/OD(manual ovedrive). A friend who has an 89 had no trouble using the switch when he borrowed my car, so I assume it was in the same location. It operates using a button on the left side of the Shift lever. The system will not engage unless the temperature of the engine is sufficient, and the RPM is high enough. For my car, the temperature must be about 2-3 tenths of an inch above the lower temperature bar on the Engine Temperature gauge(OEM). The system typically will allow me to engage the M/OD if the speed is over 35mph.
The Mazda 323 of that time from had a 1600cc engine but that isn't going to effect the issue of where to get a wiring diagram. Haynes makes a manual for the 1990-1994 Mazda 323. If you have a 1986-1989 Mazda 323, you will need to get a FSM (Factory Service Manual).
Turn the AC or the Defroster off.
The wreckers perhaps.
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Try a 1988 323
turn the key , if it starts it works..
It is on the fender right beside the coolant reservoir.
Next to the radiator on the drivers side, in front of the battery.
Mazda made a 323 "GT" turbo 4 door sedan for at least 2 years, 1988 and 1989. It featured the 1.6 DOHC (B6T) engine that was also standard for the 323 GTX. It was rated at 132 bhp.
Check blower motor fuse Check to see if blower motor is getting power
3 1/2 to 4 liters.engine oil.