CSF 3999
CSF part number 3999 is a radiator in the Cooling System system. This catalog matches it to 21 year-and-engine configurations from 2016 to 2026.
Verified fitment includes 2026 Lexus NX350H 2.5L L4 ELECTRIC/GAS ; 2025 Lexus NX350 2.4L L4 Turbocharged ; 2025 Lexus NX350H 2.5L L4 ELECTRIC/GAS ; 2024 Lexus NX350H 2.5L L4 ELECTRIC/GAS ; 2024 Toyota RAV4 Prime 2.5L L4 ELECTRIC/GAS , plus 16 other configurations. See every vehicle this part fits.
Frequently Asked Questions
What is CSF 3999?
CSF part number 3999 is a radiator with published application data for 21 vehicle configurations from 2016 to 2026. Use the manufacturer part number to cross-reference your old part or a repair quote before you order.
Which vehicles does CSF 3999 fit?
This catalog matches 3999 to 21 year-and-engine configurations from 2016 to 2026. Open the compatible-vehicles list for every make, model and engine, and read the notes for position or trim qualifiers.
Is CSF 3999 OEM or aftermarket?
What matters is the published application data for this part number, not the label on the box. CSF 3999 is listed with its manufacturer part number so you can compare it to an OEM number or another brand that covers the same fitment.
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