I have a 96 sl saturn. takes half an hour for my car to reach running temp. When i start driving the engine cools down so far, to the point i have no hot air for my heater. I replaced the thermastat, i flushed the engine and radiator, but my car still will not reach normal running temp. And my cooling fan doesn't work, even during the summer time the engine runs very cool, even when i sit in traffic, so i never bothered to fix it. any ideas why my engine won't run hot??

Oh thats not nice to say joking did you replace the rad cap as well and the water pump circulates properly it sounds like a headgasket problem but if you are sure you put in a high temp thermostat and the prestone is new and heater hoses are hot showing good circulation the problem could be in the car heater controls or vents so double check to be sure cap prestone thermo and circulation are all good test head gasket

Replace the thermostant again this time get a hotter temp thermostant and buy it from the dealer, the other thing is that these cars are known for the temp sensors being bad this would give you the false reading on the gauge but would not affect the heat, if its taaking a long time then i would replace the stant and this time or before replacing the stant i want you to flush out the heater core, remove the hoses from the heatercore and use a water hose to flush water through the heater core, a plugged core will not throw heat or will start to allow water to flow when it gets good and hot to flow through the retricted core due to rust and crud, try the flush first and then try a new temp sensor if the flush helps the heat, hope this is helpful good luck.