I have a 1993 oldsmobile cutlass ciera and the fan for the radiator wont turn on but i dont know where the sensor is for it to turn on can u tell me

Check for corrosion and ground issues. DO NOT keep replacing items. Codes only tell you what circuit, NOT the exact item to replace.

the coolant sensor in GM have the same color code for wire Black and yellow.Now coolant sensor is located on engine block or near thermostat.

could get over heat and stop engine.thermostat stuck close,rad.clog,check coolant level.could be crankshaft sensor.

i would try a crank shaft position sensor

http://www.autozone.com/autozone/parts/1993-Oldsmobile-Cutlass-Ciera/Crankshaft-Position-Sensor/_/N-izzayZ8znbj?filterByKeyWord=sensor&f

Try disconnecting the coolant temp. sensor, if cooling fan come on, replace sensor, relay is under hood drivers side on inner fender base, close to the head light.

Checkk the EGR system for the EGR valve should open when the engine gets to operating temperature. If not the engine will stall out

The thermostat should be just off of the engine. Just follow the main rad hose from the radiator. Post if you need more.

theres a coolant fan sensor in intake, but i think the problem is the fan relay,its in the right front of engine compartment on relay block.the sensor is at rear of head on coolant outlet if its a 2.2 engine, if its a 3.3 engine then the sensor is under alternator.

You should only have voltage at fan plug when temp sensor tells the computer to kick fan on.That would make the engine temp around 212 degrees,If you have voltage at fan plug when these things have happen then your problem would be the fan motor