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Weak AC & Reduced MPG - Air Filter Replacement on 2018 Tucson Value?

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Mike T. · rep 0 · May 25, 2:04 AM · 1 replies · solved · Question

Vehicle: 2018 Hyundai Tucson Value

Hey forum, I've got a 2018 Hyundai Tucson Value with around 60,000 miles. Lately, I've noticed two things: the AC doesn't seem to blow as strong as it used to, and I feel like my gas mileage has dipped a little bit. I've been pretty good with oil changes, but I honestly can't remember the last time I changed the air filters.

Could a dirty cabin air filter be causing the weak AC, and an engine air filter be affecting my MPG? What's the recommended replacement interval for these on the 2018 Tucson? Are these easy DIY jobs, or should I just take it to the dealership?

Thanks for the help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:04 AM

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ClearTheCode admin answer:

You're on the right track with suspecting your air filters, Emily! Both a dirty cabin air filter and a dirty engine air filter can contribute to the issues you're experiencing with your 2018 Hyundai Tucson Value.

  1. Cabin Air Filter & AC Performance:

    • Function: The cabin air filter cleans the air entering your vehicle's interior through the HVAC system.
    • Impact: A clogged cabin air filter restricts airflow, leading to weak AC output, reduced heating, and sometimes a musty odor. It can also cause the blower motor to work harder, potentially shortening its lifespan.
    • Interval: Hyundai typically recommends replacing the cabin air filter every 15,000-20,000 miles or once a year, more frequently if you drive in dusty conditions.
    • DIY: This is usually a very easy DIY job, often located behind the glove box. Many tutorials are available online.

  2. Engine Air Filter & MPG/Performance:

    • Function: The engine air filter prevents dirt, dust, and debris from entering your engine's combustion chambers.
    • Impact: A dirty engine air filter restricts the amount of air reaching the engine. This can lead to reduced engine performance, decreased fuel efficiency (MPG), and potentially cause the engine to run 'rich' (too much fuel, not enough air).
    • Interval: Hyundai generally recommends replacing the engine air filter every 30,000 miles or every 2-3 years, again, more often in dusty environments.
    • DIY: This is also a straightforward DIY task, usually located in a plastic air filter box under the hood. You typically just unclip or unscrew the housing, replace the filter, and close it up.

  3. Recommendation: Given your mileage and the symptoms, it's highly likely both filters are overdue for replacement. Start by checking and replacing both. They are inexpensive and easy to do yourself. If the issues persist after replacing both filters, then you might need to look into other potential causes like a low AC refrigerant charge or a more complex engine issue, but the filters are an excellent starting point for maintenance.

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