How to Replace the Cabin Air Filter on a 2018 Kia Optima (Glove Box Method)
Step-by-step instructions with required tools/parts, airflow direction tips, and reassembly checks
How to Replace the Cabin Air Filter on a 2018 Kia Optima (Glove Box Method)
Step-by-step instructions with required tools/parts, airflow direction tips, and reassembly checks
🔧 Optima - Cabin Air Filter Replacement
Your Optima’s cabin air filter cleans the air going through the HVAC system (heat/AC). Replacing it helps airflow, reduces musty odors, and keeps dust/pollen down inside the car.
Difficulty Level: Beginner | Estimated Time: 10-20 minutes
⚠️ Safety & Precautions
- 🔸 Turn the car fully OFF and confirm the READY light is off before working behind the glove box.
- 🔸 Keep fingers clear of the glove box hinge area when lowering it.
- 🔸 No battery disconnect is required for this cabin filter replacement.
🔧 Required Tools
You'll need the following tools for this repair:
- Trim removal tool
- Phillips screwdriver
- Work gloves
- Safety glasses
- Flashlight
🔩 Required Parts
HowToo sells all the parts you need for this repair:
- Cabin air filter - Qty: 1
đź“‹ Before You Begin
- Park on level ground and shift to Park.
- Turn the car OFF and remove the key fob from the cabin (or keep it away from the dash).
- Open the front passenger door for easier access and lighting.
🔨 Step-by-Step Instructions
Follow these steps in order:
Step 1: Empty and open the glove box
- Remove items from the glove box so nothing falls out.
- Open the glove box all the way.
Step 2: Disconnect the glove box damper arm
- On the right side of the glove box, locate the small “damper” arm (a small strut that slows the glove box). Damper = the slow-drop arm.
- Use a trim removal tool to gently pry the damper arm off its pin (or pop it free by hand if it’s loose enough).
Step 3: Drop the glove box down
- Push inward on both sides of the glove box to clear the side stops.
- Lower the glove box fully to expose the cabin filter housing behind it.
Step 4: Remove the cabin filter housing cover
- Find the rectangular cover on the HVAC case (directly behind the glove box).
- Release the cover tabs by hand; if a screw is present on your cover, remove it with a Phillips screwdriver.
- Pull the cover straight off and set it aside.
Step 5: Replace the cabin air filter
- Slide the old filter straight out.
- Note the airflow arrow on the old filter frame.
- Install the new filter in the same direction as the old one (match the airflow arrow). Wrong direction can reduce airflow.
Step 6: Reassemble the glove box
- Reinstall the filter housing cover until the tabs click (or reinstall the screw with a Phillips screwdriver if equipped).
- Lift the glove box back up and push the sides in again to re-seat the side stops.
- Reconnect the damper arm onto its pin (press it on by hand).
- Close the glove box.
âś… After Repair
- Turn the car ON and run the fan at different speeds to confirm normal airflow and no rattles.
- If you had a musty smell, run the A/C for a few minutes and confirm the odor is improved.
đź’° DIY vs Shop Cost
Shop Cost: $60-$120 (parts + labor)
DIY Cost: $15-$35 (parts only)
You Save: $45-$85 by doing it yourself!
Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.3-0.5 hours.
🎯 Ready to get started?
HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.
