The heater is not working

change the thermostat

It sounds like it is low on coolant. Maybe try taking a heater hose off to let air out as you add coolant. This is just a guess, not a surefire remedy. I know dodge trucks have to be blead to let the air out of the cooling system, haven't heard of it on your vehicle. But heck, it cost's nothing to try it. If it doesn't, you may need to replace the water pump. It may be wore out and only pumping enough water when the engine is revved up. That is most likely it.

May need.heater core flushed out.

See if your library has a Stratus shop manual and check the heating system chapter. You didn't say if the engine was reaching operating temperature or not. If the engine is warm but you are not, I would say the problem is in the heat exchanger somewhere. If your engine is cold, you can't really expect the heater to get warm, now can you. Then you have a different problem to chase.

Lack of water on your floor means your heater core is not leaking. It could still be plugged somewhere. The fact that you get some heat initially, but it turns cold when you turn the fan on, sounds like a lack of adequate warm water to the heater core to me. If the engine is warm, it could be a circulation problem of some sort.

Just a guess, but I don't think you did this yourself. Take it back to the mechanic and complain.

You didn't say if this was the result of the flush and thermostat change or if you had the problem previously. I tend to think this is a thermostat problem still. It is possible the mechanic simply forgot to install the new thermostat (remote, but possible).

If you have no heat and the temperature guage is pegged cold, the engine is not reaching operating temperature. It is the thermostat's job to regulate this. Does the radiator get warm?

I would take it back to the mechanic if you trust him, or try another if you don't.

Change heater core

either bad blower motor resistor (least expensive fix to atempt) , or blower motor bad or electrical circuits to motor

FLUSH RADIATOR, HEATER CORE AND ENGINE BLOCK.ADD 50 / 50 ANTIFREEZE AND WATER ALSO REPLACE RADIATOR PRESSURE CAP.IF TEMPERATURE GAUGE STILL STAY HIGH THE ENGINE COOLANT TEMPERATURE SENSOR COULD BE FAULTY.

First of all, the passenger side fan is for AC, and should come on when AC is on or defrost. Secondly, if you didn't have the heater on when you refilled the cooling system after thermostat was changed, it may just be an airlock. Run engine from cool with heater on and let it run with cap off and top it up as it goes down. Let it run long enough for rad fan to come on and go off 2 or 3 times, and keep an eye on rad level and top it up a couple of inches from top each time it goes down. Then put rad cap back on and try it. Let me know if that helps.

possibly heater core.