It is quite easy to change the thermostat in your 1990 Cutlass. Remove the thermostat housing retaining bolts. Remove the thermostat from the housing. Reverse the process to install the new thermostat.
Engine end of upper radiator hose
On the 3.3L V6 it is under the radiator cap.
The 1993 Oldsmobile Cutlass Sierra thermostat is located on the front of the engine. You can follow the water supply line from the radiator to the thermostat housing.
Should be in a removable housing at the engine end of the upper radiator hose
can i reset it or replace it ,where is it on the car
The ECM is located behind the glovebox on a 1991 Cutlass Ciera. Pull the glove box out to see it. Once located remove the mounting hardware and unplug it from the car. Replace the unit.
yes, most of the panels can be used from one to the other
follow the top radiator hose where it goes back to the egine
Yes, you do.
how do you replace the headlight switch on a 1993 cutlas ceria*
Look in the removable housing at the engine end of the upper radiator hose