Generally on the bottom of the radiator.
Nissan dealer
Place something to catch the engine coolant beneath your 1990 Chevy Corsica radiator. Remove the radiator drain plug with a 9/16 ratchet. The engine coolant will drain out.
You drain coolant from the radiator. but according to the book ther are two plugs on the engine block that need to drain the coolant from.
3500 lbs towing capacity according to endmunds: http://www.edmunds.com/used/1990/nissan/truck/1552/specs.html
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.
Yes, engines are different but the tranny's the same.
1990 Nissan/Datsun Truck D21 Truck 2WD 2.4L FI 4cylThe Spark Plug Gap.044 (In thousandths of an inch)
no only fits 84,85
In the ac box
Crawl under the Front end of the pickup and look up at the bottom of the radiator.About 1/2 inch up on the left or right corner of the radiator is a twist knob,usually White.Turn that counter Clockwise.That is the plug.Oh,The direction to see the plug would be looking at the radiator from the engine compartment side.
Go to www.installdr.com .
Follow top radiator hose to top of motor and it will be under it.