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check out ebay.
I don't own a 1993 Nissan Pickup Truck, stupid! check your thermostat to see if it opening
check eBay or Nissan dealer ,they are pricey at Nissan ,about 75.00 bucks.
Depends on which year/model. Check http://www.edmunds.com/used/nissan/index.html for specifics.
check both of your pulleys,they have marks on them.
call auto parts and check part numbers on both years to see if they match.
install a new one!!
Check the radio/Acc fuse...
Check the heater core if weather not responsible.
A 1990 Nissan pickup truck has power steering. If the truck is displaying symptoms of not having power steering check the fluid levels and pump itself.
Check your EGRC Solenoid valve.
Check your engine. Check your fluid levels and add if needed.