How do you change the serpentine belt on a 1990 Toyota Celica ST?

the radiator top plate or shock tower should have a diagram for the path the belt should travel. you just need a box wrench or socket wrench to move the tension pully(usually smallest pully on engine) as i am unfamiliar with the specific engine you may need to loosen the left motor mount if the belt would normally travel a path around instead of under it either way it is an easy job to do by yourself good luck.
How do you change the serpentine belt on a 1990 Toyota Celica ST?
Go to Advance Auto Parts and get a book on your make and model of car. Look in the book it has detailed directions. Even shows what tools to use.

how long should i wait

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