1989 Volvo 740 Turbo Overdrive turns off intermittently

oxymoron1 · Post by **oxymoron1** » 13 Jul 2003, 08:13

There doesn't seem to be any pattern or weather condition. Driving along the car drops out of overdrive and the arrow comes on. The button on the shift handle won't re-establish overdrive. At some point it will re-engage overdirve on it's own. It is very intermittent. I've heard about a sensor that gets clogged and just needs to be cleaned. Can someone direct me to that sensor?

dpauto.com · Post by **dpauto.com** » 13 Jul 2003, 14:11

Sounds like you need a new overdrive relay behing the ashtray.

Dave

740 turbo dave · Post by **740 turbo dave** » 02 Aug 2003, 01:00

had teh same problem on an 89 turbo wagon with 230K miles. The relay wasn't it so I changed the overdrive solenoid on the left side of the transmission along with new o-rings and it shifts like a champ again.

scoots · Post by **scoots** » 03 Aug 2003, 12:42

This same thing started happening to my 88 740 wagon it was the relay that was going out. Got one from the junk yard and works fine now. I believe it was the relay on the back right side, behind the fuses.