follow the top radiator hose to the engine.
The 1990 Grand Am was a popular car. The curb weight of the 1990 Pontiac Grand Am was 2,739 pounds.
The PCV valve is located under the MAP sensor on a 1990 Pontiac Grand Prix. The MAP sensor is in the upper plenum.
yes it should bolt right up as well as the original motor and tranny
The thermostat is located on the front of the engine under the elbow at the end of the radiator hose
Check the engine end of the upper radiator hose
locate the top hose on the radiator drive side follow it back to thermostat housing it's were the clamp is at on the end of the hose.
open the glove box and look to the right
Should be in a removable housing at the engine end of the upper radiator hose
On a 1990-91 it is behind the housing the upper hose attaches to ON A 1.6 LITER
This information should be on the fan shroud.
I am not an expert on the 1990 Grand Prix but on a GM product I would look for a round flasher assembly located near the fusebox downunder on the left side of the dash.
The 1990 Toyota Corolla thermostat can be found on the front of the engine. The thermostat will be inside of the thermostat housing.