As an Amazon Associate I earn from qualifying purchases.Updated: April 03, 2026
The Filter Drier in your Carrier Infinity 18ACX plays a crucial role in removing moisture and contaminants from the refrigerant system. Over time, it becomes saturated and less effective, potentially leading to reduced cooling efficiency, system damage, and premature failure. Replacing the Filter Drier periodically ensures optimal performance and extends the lifespan of your unit.
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Function: Removes moisture and impurities from the refrigerant cycle, protecting components and ensuring efficient operation.
Signs it needs replacing: Reduced cooling capacity, unusual noises from the system, or leaks.
OEM vs aftermarket: OEM parts are designed specifically for Carrier units and offer guaranteed compatibility. Aftermarket options may be more affordable but require careful checking to ensure proper fitment.
Installation: Installation typically involves draining the refrigerant, removing the old Filter Drier, installing a new one, and recharging the system. It's recommended to consult a qualified HVAC technician for installation.
Replacement schedule: every 5 years
Compatibility warning: Always verify part number R4KJF000S003 matches your exact model (18ACX080A) before ordering.
Pros & Cons
Pros
✓ Restores device to original performance without buying a new unit
✓ Significantly cheaper than a full device replacement
✓ Multiple options available from OEM and aftermarket sellers
Cons
✗ OEM parts cost more than third-party alternatives
✗ Wrong part number will not fit — model verification is essential
Common Use Cases
Scheduled maintenance on the every 5 years replacement cycle
Performance restoration after noticing reduced output or efficiency
Preventive replacement before a worn part causes secondary damage
Who Should Buy This
This replacement Filter Drier is for the owner of a Carrier Infinity 18ACX whose unit is experiencing reduced cooling performance. Replacing the Filter Drier can help restore efficiency and extend the lifespan of your system.
Not ideal for: If your Carrier Infinity 18ACX is experiencing multiple failures or nearing the end of its expected lifespan, a full replacement may be more cost-effective in the long run.
Good to Know Before Buying
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Always confirm your exact model number (18ACX080A) before ordering. Part numbers vary between model variants and production years. Check the label on your device or original documentation to be sure.
Frequently Asked Questions
What is the part number for the Carrier Infinity 18ACX Filter Drier?
The part number is R4KJF000S003. Always verify this matches your exact model (18ACX080A) before ordering, as similar models may use different parts.
How often should I replace the Filter Drier on my Carrier Infinity 18ACX?
every 5 years
Will aftermarket Filter Drier replacements work in my Carrier Infinity 18ACX?
Third-party parts are widely available and often cheaper than OEM. Look for listings that specifically mention compatibility with model 18ACX080A and check buyer reviews for fit confirmation before purchasing.
Prices change frequently. See the latest deal on Amazon.