Hi,
if you find a burnt fuse don't be happy, be carefull as usually there is areason for burnt fuse (shortcut?).
In older 850s of 94 the seat heating construction was not built to last. The metallic spring construction parts rub off the heating wire insulation in normal use and cause a shortcut or heating resistor wire break and cold you are, lucky if you don't get the seat cover burnt by shortcut.
Have two 850s with four cold front seats now while the oldie saab900/88 is still heating fine. Would hope volvo be able to learn something here.
There used also to be a bimetallic thermostat embedded to cut the current instead of over heating.

br Tapsa

First check the fuses. If neither the seat or seatback get warm, pop the switches and swap with the passenger one, assuming the pass side gets heat.

Klaus
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The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)