At some point the 740 wagon became the 940 which was made until '95. I looked at a 91 or 92 940 but eventually found a '93 940 wagon. It is a really great car!. Volvo improved the rear seat fold-down over the earlier 740/940. In the earlier models where the head rests had to be removed to the lower the seat back. On the '93 the headrests automtically retract as the seat back fold down. 'Works really slick.

The engine also was improved with oil jets to cool the pistons. This allowed closer piston fit which reduces the chances for piston slap which my '88 240 has. The AC system is set up with R134 and really cools. The cooling fan is electric.

I'd strongly recommend a '93 - '95 940 wagon. The last and best of the Volvo red-block engines which you know how to maintain, rear wheel drive, great cargo room, comfortable. My '93 came with leather seats, heated electric rear view mirrors, heated seats, sunroof, decent stereo, is quiet, has locking torque converter, dash lighting wuch lets you see the instruments at night.

My only gripes are it could use a little more power (VX cam?) and the alloy wheels collect brake dust which seems to bond permanently to the wheel paint.

You could consider the 960 wagon but there you'll have to learn a new set of maintenance problems.