If the Heating A/C fan only works in certain positions ie. 3&4 but not 1 or 2. You most likely need a new blower motor resistor.
Problems for specific Dodge Stratus years:
Car problem reports
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Newest reported 2002 Dodge Stratus problems
For the sedan trim only, Coolant can leak at the coolant bleeder valve and is usually evident because of an orange crust formation on the housing. A revised bleeder and housing is available to correct this problem.
"False" trouble codes may cause erroneous illumination of the Check Engine Light. Updating the PCM software can often correct this concern.
Spark plug tube seals fail, causing the tubes to fill with engine oil and the engine to misfire. As a result, the engine may run poorly and fuel economy can suffer.
If you hear a honk or "fog horn" sound within a few seconds of turning on the air conditioning, that can be fixed by replacing the AC expansion valve. Occasionally vibration from the honking can be felt in the steering wheel and car seats.
A click heard when turning the steering wheel may be solved by aligning the steering column or installing revised parts in the column (requires removal of the steering column).
A plugged AC evaporator drain tube can cause a water leak inside the car; usually near the front passenger's feet.
Defective speed sensors on the transmission can cause problems with the cruise control and speedometer operation, as well as erratic shifting. The connectors on the sensors can corrode and/or the connector terminals can spread (poor connection), which will create similar symptoms. Any of these problems can cause Check Engine Light illumination.