My 2001 saturn L200. series will not stay running i just had to put in a new motor, a whole new fuel pump assembly, fuel filiter, and cat converter, i love this cat but after driving it for a while it jsut stalls out. my mechanic is baffled. any suggestions he did try all the most likely things. and nothing is working

SOURCE: Intermittent blower motor failure

A broken/burned motor winding will do exactly this. If you measure it when cold it will look good. The broken/burned winding will only open from heat expansion.

SOURCE: 2001 Saturn L200 start and stall

Have you done any component testing? U1000 is a data issue, cant read pulses per minute. This is usually due to a defective crank sensor but you should do component testing first so you don't replace parts on random. Other reasons for this failure can be faulty ignition switch cam positioning sensor, Blown fuse, bad ground, or ECM.

SOURCE: 2001 Saturn L200 blower motor does not work in highest switch pos

Blower motor resistor. Located next to/ near the blower motor itself. These are common failures for no high speed blower operation.

SOURCE: Where is the fuel pump located on a 2001 Saturn

you have to remove the gas tank you have to remove the exhaust pipes to get to the gas tank the best way to get to it is to put the car on a lift once you remove the tank you will see it on top it is one piece connected to the fuel gauge and the entire thing is inserted on the top side it is hard to get to because there is no access panel under the back seat like in japanese cars it is a pretty costly item too, good luck

SOURCE: the cooling fan comes on

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