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Q: why doesn't my car shift into overdrive when cold? on 1994 Toyota Corolla

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
this problem only occurs when car is cold. when it is warmed up it works fine.
(1) Answer
It's not supposed to go into overdrive until the engine reaches a certain temp. to improve emissions controls. Is it taking longer for the engine to warm up? Maybe thermostat is opening to soon or is stuck partially open. If it concerns you , get it checked and verified before randomly spending money on parts.