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Overdrive always on

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1986 - 1991 780
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90

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Overdrive always on

Post by Guest »

I have a 1991 Volvo 240

Out of the blue one day, I started my car and the overdrive was on. I had never switched the car into overdrive before. I tried pushing the button over and over and over as I drove, but that did not work. Someone suggested replacing the od relay, which I did do, but that did not fix the problem.
So, someone else suggested replacing the actual switch. I will do that if someone can convince me that is the problem. I just don't want to waste any more money randomly trying to fix it.

Only argument I have it not being the swtich is that the od randomly came on one day when I turned on the car. Never had a problem with it coming on before. I suppose it is possible that the switch somehow busted into the on state and cannot be toggled off.... dunno.
I've read around and people are talking about an OD selenoid. I just ordered a Volvo 240 Series Repair Manual, so I assume that will help me out.

I *really* don't need the OD on this model. I NEED the 4th gear :) Any advice?

LaRy
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Joined: 15 January 2004
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Location: Sweden
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Post by LaRy »

Try to drive without OD relay. Take it out. If OD is still on when driving, it is in the gearbox. Then you could find some advices in the repair manual how to check the solenoid. If OD is not on without relay, it is an electrical problem. It could be the switch.

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