allows power distribution to the overdrive solenoid for overdrive engagement.
The overdrive relay is located in back of the fuse box which is behind the ashtray.
behind the glove In the relay/fuse panel behind the ashtray. After you remove the ashtray and holder you will need to remove the box above it to access the relay
Behind the ashtray is where it is located. You will need to remove the box above the ashtray to gain access to the relay as you can't slide the fuse/relay panel out otherwise. BTW if the car is an automatic the relay is white and sits on the left side of the panel
Try overdrive relay, you can buy them anywhere, replace old one, it is very easy.. I had to replace one on my 88 740. Give it a shot before you let someone work on it.
change the overdrive sensor should be on the left side of the gear box.
My 1991 740 volvo turbo doesnt start specially during the morning.Is it comes with a cold start valve?
in the center console, under the Radio
Yes I just did that to mine, and it works great. No problems.
I had this problem about ten years ago on my 1990 740 GL. The problem was actually a defective relay. The relay is controlled by the button on the gear shift knob and is used to prevent going into 4th gear when towing. It is located among all the relaysbehind the ashtray in the center console panel. Behind all the fuses. At that time I went to the Volvo dealer and bought a new relay and from that worked out which relay to change. In those days it cost me about $45.00. Has worked fine since then. Good luck. You must to isolate the source between the Overdrive relay or the Overdrive solenoid and the overdrive switch at the shifter. Ignition on, engine off - Push the overdrive switch, if you can ear a light click the relay and the switch are probably Ok, check the overdrive solenoid at the transmission. If you don't have the click you have to trouble shoot the switch to see if it's working. - Check continuity to the switch and the 12 volts. - If evething seem to be OK, change the Overdrive relay Good luck
They are at the back behind the ashtray, look in the gap at the top of the fuses.
pull out ashtray and lighter- realys are behind ashtray
You probably mean Overdrive solenoid, on the transmission left side Hope it's help