Transmission Overdrive Inoperative, Upshift Arrow On All the Time on Volvo 240

Light stays on wll not shift into overdrive.

Won't shift into overdrive/sometimes will,sometimes won't.

Red overdrive indicator on, will not shift into overdrive. Not resolved

1993 Station wagon's Rear window would fog up and the Up shift arrow remained on. These two components have a common fuse. The fuse was replaced, problem solved.

no overdrive

upshift arrow on all the time

overdrive isn't working have not fixed it yet. just got the car

Recently I was driving on the freeway, like I normally do. And my rpms just shot up out of no where. This freaked me out because I was going about 75. And since this problem has occurred, I've noticed my rpms are about 500 revolutions higher than normal, which doesn't allow me to go past 60 on the freeway anymore. I feared it was transmission problems. I saw in the previous comments that often times the overdrive will be off, and that goes the same for my 91' beast. It just feels like my car is always forced now.