Should be in a removable housing at the engine end of the upper radiator hose
Is on the engine block on the upper water hose.
IF YOU FOLLOW THE LOWER RADIATOR HOSE TO THE ENGINE,YOU WILL LOCATE THE THERMOSTAT HOUSING.THERE ARE TWO BOLTS THAT HOLD THE HOUSING ON. THE THERMOSTAT SETS INSIDE THE HOUSING.
When you do a oil change on a 1986 Toyota Tercel it holds 4.5 quarts of oil. As recommended in the owners manual always double check your dipstick after changing the oil and putting in new oil.
Almost all thermostats are located where the top radiator hose connects to the engine. The tube that the hose goes over should have two bolts holding it on. The thermostat is under that.
Follow the upper radiator hose towards the engine block, The part the hose clamps to is the thermostat housing, the thermostat is located under this, generally this requires moving 2 or 3 bolts to acces the thermostat.
Nothing out of the ordinary with a 22 year old car
3.9Ltrs of 80w-90w grade oil
follow the upper radiator hose to the thermostat housing on engine. Thermostat is located under the thermostat housing.
tire pressure varies by type, but it is always written on the sidewall of the tire.
The thermostat for this car is located in the water pump housing from the lower radiator hose.
Buy a new one and you will see what all you have to take loose.
Linkage is probably sticking or seized