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Dan:
My 1990 745 has the same set-up.
DO NOT disable/remove either cooling fan. Each serves it's own purpose.
Sooner or later, they both will fail, for different reasons - hopefully not simultaneously.
An inoperative electric fan can be caused by any of several conditions:
1) fan itself is burned out. You have eliminated this by powering directly.
2) thermo switch on side of radiator, passenger side not working.
This is not easy to check. I just went ahead and replaced mine, figuring that it was 10 years old. Note: ALWAYS replace the rubber grommet
into which the thermo-switch is seated. NEVER try to re-use the grommet.
Lube grommet with Vaseline inside and out before installing it.
3) Relay is bad. Mine was. It is the outboard one of 2 identical relays
mounted on the front side of the passenger side strut tower. You can test this theory by switching it with the inboard one, then jumping across the thermo-switch contacts with ignition ON. If fan runs then, replace relay
4) Coolant just isn't hot enough to trigger fan operation. This could be possible during the winter: however, mine still comes on, even in November, during prolonged periods of idling (ie, stuck in traffic, waiting in line at toll booth after high-speed run, etc.).
Volvo didn't put both fans on these cars without good reason. Get them both in order (by the way, the viscous clutch driving the engine-mounted fan will fail sooner or later as well....).
George in PA
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