|
Before replacing the relay as suggested below, locate the relay from the description below, take a drive, and tap the relay as you are driving. This will usually make the overdrive kick back in if it is the relay.
AW-70/71 Overdrive Problems: Relay, Switch.
Relay Problems and Repair:
[See Relay Locations for a detailed picture of relay location and removal instructions.] [Symptom:]I have a friend with a '90 740 automatic and he is having intermittent OD problems that seem to be weather related. It won't go into OD when the weather is cold. Is the relay on the relay tray? If so, which one is it? [Diagnosis:] Yes it does sound like an OD relay. If I remember correctly on 740 it is by the Ashtray/FuseBox. It is pretty common component failure on the bricks. It will be a white Hella relay. Pretty simple to change. The relay is about $40-43 through Mail order from dealership. In my case I was "sure" it was the wiring, switch or solenoid, as the relay "looked" just fine. But as soon as I replaced the relay, all problems disappeared. The relay is about $40 from the dealer, or you can probably find it cheaper from a second source...it appears to be a standard Hella relay.
[Response 2: Michael Daley] I have just repaired the o/drive relay and rather than pay the UK£40 that the volvo dealer wanted for a new one, I took the top off the relay - all that was wrong with it was a cracked solder on the circuit board. Fixed with a soldering iron in 5 minutes, saving myself £40!!
For a more detailed discussion of relay repair, see Relay Repair vs. Replacement.
[Another OD Symptom:] I have a '93 940T with an AW71L transmission (or so I've been told...) Today I was driving on the highway and it momentarily dropped out of overdrive into 3rd, at the time I was at minimal throttle. I dismissed that as a hiccup. An hour later (after making a couple of stops)I began driving and I noticed that the tranny would not go into OD, 3rd gear was the max. All of the other shifts are perfect. I tried pressing the OD cancel button a few times, and I checked the related fuses - no changes. Am I looking at replacing the overdrive solenoid on the tranny? If so, can anyone give me a part# and/or approx. price? [Response: Abe Crombie] It is an AW71 no L. The turbos didn't get the locking torque converter feature. The trouble sounds like the typical OD relay failure. The relay is behind the ashtray in the fuse/relay panel. I believe it is white on that car and square in profile. The fuel system relay is the one to the left that is rectangular.
|
