* Blowing air from the vents when the AC/heater is off? This could indicate a problem with the blower motor, its resistor, or a vacuum leak in the HVAC system.
* Blowing hot air when you want cold air (or vice versa)? This suggests a problem with the AC system (refrigerant leak, compressor failure), the heater core, or the blend door actuator.
* Blowing air only from certain vents? This points to a problem with the vent actuators or a blockage in the ductwork.
* Blowing air with a strange smell? This could indicate a problem with the cabin air filter, a leak of coolant, or something else.
* Blowing unusually strong or weak air? This is likely related to the blower motor, its resistor, or the fan speed control.
* Is the air leaking *into* the car from outside, perhaps around a window or door seal? This is not a problem with the air conditioning or heating system itself.
To get a more helpful answer, please describe the situation in more detail. Include information like:
* What kind of car do you have? (Make, model, and year)
* When does the problem occur? (All the time, only when the car is hot, only after driving for a while, etc.)
* What are the conditions? (Is the engine on or off? Is the AC on or off? What temperature is selected?)
* Are there any other symptoms? (Unusual noises, smells, etc.)
The more information you provide, the better I can help you diagnose the issue.
