Skip the auto shop - Our mechanics make house calls

Q: Having problem with ouside air coming into the A/C

asked by on

We are having a problem with our A/C in the car. We are thinking about taking it to the mechanic. The issue is that we're getting random whiffs of outside air, as if the recirculation isn't fully working. When we're driving, the air seems to be super cool and dry like normal. So it isn't a problem until we get behind a vehicle with lots of exhaust or anything with a strong smell.

Also, when we're stopped at a light or idling, the air gets slightly more humid than usual. We haven't replaced the cabin filter recently. Could that be it? Or something else?

Since the A/C compressor is driven off the engine crankshaft, the A/C will typically work better at higher RPMs. What you’re experiencing may be normal for your vehicle, or you may need an A/C system recharge to restore peak A/C performance.

Replacing the cabin filter is a good first step towards eliminating any offensive odors. Once again, being able to detect some outside odors may be normal for your vehicle. If the odors are excessive, suspect a problem with the blend door or its control system.

The best way to get to the bottom of these issues it to have your vehicle’s A/C system inspected by a professional, such as one from YourMechanic.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Nissan NV 400 hissing noise from servo when you push brake pedal lightly 2013 Nissan NV 1500

Hi there - yes, I believe you are correct. Sounds like the diaphragm in the booster has ruptured, and is leaking air (to the engine), resulting in little or no brake pedal effort assist. I recommend a brake booster replacement](https://www.yourmechanic.com/services/hydraulic-brake-booster-replacement)...

Q: When I start my car on a cold morning I have to pump the accelerator to get it to start.

As a general rule, car engines do not like cold weather and do not do operate as well in cold weather. When you start your car in the morning and turn the key to on, the coolant temperature sensor immediately...

Q: My car is not starting; what should I replace?

Your engine's computer gets crank signals from the crankshaft and camshaft sensors and then uses these signals to fire the coils. To see if the sensors are sending these signals to the computer, you can scan the computer using a...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.