Good luck, but prepare to be disappointed. The aux fan on my '92 threw 2 blades last fall, and I shopped eBay relentlessly for 8 weeks trying to find one. The closest I came was an aux fan for a 700 series. I think its location makes it a prime target for damage in any sort of front-end collision, so there are not a lot of used ones around. One of my kids nerfed a big SUV with a trailer hitch last winter, and the grille and the aux fan were both casualties.
Because I live in the desert and use AC nearly year round, having an aux fan is a must. Hence I bit the bullet and found the cheapest new one at eeuroparts, one of the advertisers here on BB. $140 out the door - shipping is free. I think there's a different fan listed for later models, so makes sure if you order one you specify the correct year.
Actually I just mounted the fan yesterday, and I had to wait a week to get new rubber mounts from Volvo. Expensive little buggers - $9 each (need 3), and for that price they don't even include nuts! So if yours are still intact on the old fan, save them! Also, the new fan came with a harness for 2 speeds, the second speed wired going to a resistor. My old fan was a single speed, so I just removed the resistor and wired it straight thru.
The aux fan really does make a difference in the heat removal. If you have an '87 it's the older style AC which can use as much help as possible, so the fan is a good idea. I took Chris Herbst's suggestion and jumpered across the pressure switch which turns the fan on and off, so it runs any time the AC is on instead of intermittently.
One last suggestion - since you live south of the Mason-Dixon line, you might consider running an 88C thermostat in the AC months, rather than the 92C 'stat. (Don't hold me to the numbers, they're close... point being there are 2 temp ratings). One might argue that the lower coolant temp in the engine means more heat rejected through the radiator, but I have not found that to be true. By accident, the last 'stat I got was the cooler one, and the AC seems to work slightly better with it than the hotter one.
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