TSI Supercool HFO-1234yf Total Leak Stop Plus with U/V Dye — 1-Can Aerosol Kit, Quick-Connect Hose, Safe on Metal & Rubber

TSI Supercool 39241B-YF Total Leak Stop Plus U/V Dye is an HFO-1234yf formulated sealant and dye that safely stops small leaks in metal and rubber A/C components and includes a quick-connect hose for one-vehicle treatment.

This aerosol kit was created specifically for modern vehicles charged with HFO-1234yf refrigerant and combines a leak-sealing fluid with U/V dye for fast location of slow leaks. It uses a patented HFC-free BOV delivery system to let you apply product quickly and safely through the low-side service port. The formula lubricates the system and is free of harmful polymers, so it’s compatible with recovery/reclamation equipment and should not harm A/C components when used as directed.

How do I confirm this product fits my vehicle?

Before use, verify your vehicle’s refrigerant type is HFO-1234yf — this product is not for R134a systems. The low-side service port for 1234yf is larger in diameter than the R134a port; the quick-connect hose included should fit snugly. If the coupler doesn't seat securely, the system is likely not 1234yf.

• Check the vehicle A/C label or owner’s manual for refrigerant type.
• Ensure the included HFO-1234yf quick-connect coupler fits the low-side port snugly.
• Do not use if the coupler is loose or the system is labeled R134a.

What kinds of leaks will this stop and where?

The formula is intended for small leaks in both metal and rubber air-conditioning parts such as evaporators, condensers, hoses, gaskets and O-rings. It’s not designed for large ruptures or structural damage but works well for slow weeps and pinhole leaks that are otherwise difficult to detect.

• Effective on evaporator and condenser pinholes and weeps.
• Seals leaks in rubber hoses, gaskets and O-rings.
• Not meant for major system failures or large ruptures.

How is the product applied and what safety or equipment features matter?

Application is through the included HFO-1234yf application hose with a quick-connect coupler; the patented BOV delivery system controls discharge for safer handling. Each can is overfilled to ensure enough fluid enters the system and to compensate for residual fluid left in the hose after injection. Scan the QR code on the box for a short installation video to follow the correct procedure.

• Use only on systems confirmed to be HFO-1234yf.
• Attach the quick-connect hose to the low-side port and follow the video instructions.
• One can is formulated to treat a single vehicle; avoid overfilling or multiple injections.

Will this product harm my A/C system or recovery equipment?

TSI Supercool Total Leak Stop Plus is formulated without harmful polymers and is designed not to damage system components, recovery, or reclamation equipment when used as directed. The formula also provides lubrication to moving parts within the compressor, helping maintain performance. Still, treat it as a temporary or diagnostic remedy; consult a professional if leaks persist or for system evacuation and professional repair.

• No harmful polymers—compatible with recovery/reclamation tools.
• Lubricates system internals and is safe for hybrid and electric compressors.
• Consider professional service for persistent leaks or major repairs.

Who is this for: This kit is aimed at vehicle owners, technicians and DIY mechanics who need a fast, one-can solution for small A/C leaks on HFO-1234yf systems. It’s ideal for diagnosing and temporarily sealing slow leaks in evaporators, condensers, hoses and seals on modern cars and light trucks, especially where quick leak identification via U/V dye and safe application are priorities. Not intended for R134a systems or large structural repairs.