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 1,000 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
  1. Home
  2. Questions
  3. Having problem with ouside air coming into the A/C

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: My truck is vibrating when braking

Towing and the symptoms you are experiencing are probably unrelated. My guess is that your brake rotors are warped. Sometimes, warped rotors are more noticeable at certain speeds. This is a pretty easy fix, which can be cured with a...

Q: Upon doing a valve adjustment all of a sudden no fire to the spark plugs why?

Hi There, It sounds like in the process of making your adjustments you may have possibly impacted the camshaft position sensor. The camshaft position sensor is a magnetic sensor that monitors camshaft speed to regulate ignition timing and fuel injection...

Q: Auto locking seatbelts

Hi there. Unfortunately, the National Highway Traffic Safety Administration has established laws against tampering with seat belts or other safety devices. That means that this lock function can't be modified.

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...