The R1234yf 4‑in‑1 FIX refrigerant, dedicated to cars 2017–present, is an advanced air-conditioning recharge formula that combines cooling, protective, diagnostic, and sealing functions. The product enhances system performance and supports long-term operation. Ideal for drivers who want to quickly refresh and restore A/C performance. The addition of a UV dye helps easily locate the sources of leaks in the A/C system.