The cooling fan comes on even when engine is cold and the engine stalls out on my 2001 Saturn l200

Would seem to indicate a faulty coolant sensor. If the sensor is mistakenly triggering the cooling radiator fan to come on then it most likely that it telling the ECU in error that the engine is at running temperature. When the engine is cold at start up the coolant sensor is supposed to inform the ECU of that fact. The ECU then sets a longer injection time to enrich the fuel/air mix to keep the engine running. As the engine warms the ECU responds to the coolant sensor signals by shortening and therefore leaning the fuel air mix. Your engine is stalling due to there not being enough fuel at idle at low temperatures. Check the connections to the sensor, they should be clean and free of corrosion (do not confuse the sensor with the temperature sender connected to the indicator on the dashboard; the sender has only one wire to the top of it). Check that there is continuity between the coolant pins. If it has four pins then the pair of pins diagonally opposed are on the same circuit. If there is a break (infinite resistance) then replace the sensor. You can check the sensor function by removing it and measuring its electrical response when its tip is put in hot water; generally the hotter it is the lower its resistance, with one pair of pins being about half the resistance of the other pair. As it cools the sensor increases its resistance. failure to see this indicates that a new sensor is required

Dear,

please get the thermostat valve checked wheather it is working correctly or not.
also look for the belt tensions as well

thanx

Engine temp sensor maybe failed and car not warming properly--get vehicle scanned at a parts place to confirm