If the automatic transmission shifts in and out of overdrive while cruising, it may be due to the thermostat that is stuck open. The 323 transmission is especially effected by the engine running too cool. If possible, check to see the engine is running at full operating temperature while cruising. The temperature gauge in the 323 may also read normal when the engine is not reaching normal operating temperature.
Transmission Shifts In and Out of Overdrive on Mazda 323
Average mileage: 77,000 (77,000–77,000)
7 people reported this problem
2 people shared problem details
the light for the over drive keeps going on and off and it seems that the car is very heavy
1990 Mazda 32377,000Visitor
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