2001 Dodge Stratus, new battery, turns over well and runs fine in temperatures above 20 Degrees. Below that, the motor spins but the car does not start until everything warms up. The antifreez/coolent is topped and HEET is added to the fuel when cold weather starts. Any clues? Thanks! Mark in Missouri misery

Change all your relays,especially in the engine bay,check your idler control valve/servo for faulty or short circuited.Also check all the fuse boxes for contamination,Spray with circuit board cleaner or something similar.

You may or may not have a problem with the fan. It should come on around 220 degrees or when the ac is running.
The temp on the gauge and the temp the computer sees can be 10 or 15 degrees different either way.

COOLING FANS DONT TURN COULD BE FAULTY FAN RELAY.FAULTY PCM AND FAULTY COOLANT TEMPERATURE SENSOR.CODE SCAN FOR FAULTY PCM CODE AND A FAULTY COOLANT TEMPERATURE SENSOR.SEE IF ENGINE COOLANT TEMPERATURE SENSOR IS GIVING CORRECT COOLANT TEMPERATURE USING A CODE SCANNER.IF ENGINE IS 190 DEGREES AND THE ENGINE COOLANT TEMPERATURE SENSOR READING 100 TO 80 DEGREES COOLANT SENSOR IS BAD.HOT WIRE COOLING FAN TO SEE IF FAN MOTOR WORKS.BECAUSE COOLING FAN MOTOR COULD HAVE OPEN CIRCUIT CAUSING ELECTRIC MOTOR NOT TO TURN ON.

I have a 2001 dodge stratus it started everything worked fine untill i took the radio out to put in a aftermaerket in, now the car wont start but everything works normal

Sometimes a motor is more sensitive to warm conditions. When the water temperature sensor does not cool off it keeps the engine in a warm run mode which is very lean. This is how lower emissions and better fuel economy are made.

The "cold start sequence" makes a richer fuel mix for starting and running. I have not seen a dividing point where this switches from one mode to the other. IF it is say 180 water temperature degrees and your car stays above 180 degrees turned off after running, then the fuel mix will be very lean until the engine coolant loses heat.

About all you can do is put in a new thermostat of proper temperature or a lower temperature thermostat. You could flush the radiator and back flush the block so that heat loss is more efficient. You could put in a new water temperature sensor. You want to get rid of calcium-fication of the internal surface areas so the components are more like factory new.

this car needs tested by an autoelectrican to check voltage/or did you just leave a door open/tailgate this in turn leaves a light on and run the battery flat.adrian;;;;

Look for a loose connection to the temperature sender unit on the motor.
If all connections OK, you may need a new temp sender unit.

bad (-) or (+) connection on the batt.

sounds like your alternator is bad have it tested to see