Well, I have a new Matrix, and I find that the fresh air always comes in. The faster you travel, the more air there seems to be. I think it's normal, as a big emphasis on air quality, and probably safety for the occupants.
i have a lumina. fresh air blows even when vents are off. its not normal (for my car at least). my intake flaps stuck open.
Yes.
Check your spark plugs and spark plug wires. One may be bad. Do you smell gas if you turn your fresh air vent on?
Even when your vents are closed, air still is being pulled into the car. The musty smell means you inside cabin air filter needs to be changed. You can gain access to the filter through your glove box.
The purpose of the AC vent hose in a car's air conditioning system is to carry cold air from the air conditioning unit to the vents inside the car, allowing the cold air to be distributed throughout the interior of the vehicle.
The air conditioner is low on refrigerant.
the air coming from the vent is warm
It's called a "vent", as in "ventilation." They generally take air from outside the car, unless you've got it set to "recirculate." Most likely air is being forced into the system because the car is moving, and that's the air that's blowing through the vent even though the fan is turned off.
Car air fresheners eliminate odors and provide a pleasant scent inside your vehicle. Available in various forms like sprays, vent clips, and hanging trees, they keep your car smelling fresh. Glimexy offers designed car air fresheners and bulk custom options.
No filter, just a screen .... the sour odour is either something crawled up and died under your car or your catalytic converter is in need of a change
If the AC is on Vent and it blows hot air in and the temp is at coolest. I think it does not matter because when you have it in vent it is venting air from the out side, it will start blowing air from the out side meaning if its hot out side the air will come out hot. Sometimes a car might blow hot air when you have it on full AC and cooldest. When you accelerate your car hard but it should cool down after you stop accelerating hard.
for me it works best to put either a car hanging freashener in front of my air vent or putting 2 dryer sheets in the vent. GOOD LUCK!
Your heater core is leaking.