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Hi,
I don’t know anything about these cars as I’m a 240 man.
What I will say is, it seems that you have noticed the problem right after getting in the car and driving someplace.
This means you had just used the door key in the door lock of the drivers door.
You then got out and more weird things started to happen, right?
I think you have a broken switch in the drivers door.
These can be a problem on the 240’s, especially with the wiring around the switch on into the switch inside the door. Removal of the inner door panel is the only entry point.
On the 240 tailgates they run the harness through the hinges and that breaks down the wires.
So you might even consider the harness in the hinges area of the drivers door.
I think the 900’s do not route the tailgate harness through hinges but loop in it under the top of the door, to the top of the roof?
The 240’s had wiring harness issue in the early years, say the mid eighties, of just plain getting rotting insulation.
I don’t know if the factory ever got them foolproof up to the end of the 240 production.
Why wouldn’t Volvo use nearly their same vendors but changed design, later?
I’m just going to say that the 900’s can develop these problem with age and use.
A lot of issues depend on under what environments the cars were used in?
It has been long enough for some type issue to develop.
I always point my self in the direction of “What can the human hand touch and wear out? Breaking is another word.
The drivers door and a tailgate are probably the most used and abused door on any car!
The tailgates get dropped, especially, if the lifts are weak in summer and they get worse when it’s colder!
Lots of plastic clips hold the locking rods tight.
It is a place to at least to start looking!
Phil
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