Volvo Repair: Overdrive, fuse panel, repair history

Question
What would keep my 86 740 Volvo sedan from going into overdrive? I don't know the repair history because I bought the car, used, from an individual.

Answer
it could be a  bad relay or bad overdrive solenoiod bad switch.most common is the relay goes bad.he overdrive  pump relay is located on the fuse panel behind the ashtray.remove the ashtray and then remove trim around lighter socket then you will see 2 screws remove the screws and the storage area will come out the relay is white and about 1x1x3  inch.it will be towards the passengers side of the panel.sorry for late answer was unable to access the site due to problem on the site