HOSE, COOLER REFRIGERANT SUCTION, NO.1

Refrigerant Suction Line for Toyota A/C System ❄️

This low‑pressure A/C hose carries cool vapor refrigerant from the evaporator back to the compressor. It keeps the system sealed, returns compressor oil, and stabilizes cabin cooling in hot weather. A correct suction line prevents air and moisture from entering, which protects the compressor and preserves cold air at the vents 🧊.

How it works

Inside the HVAC loop, refrigerant leaves the evaporator as low‑temperature gas. The hose’s barrier rubber and crimped alloy ends guide that gas to the compressor inlet. Internal diameter is tuned to keep suction pressure right, while O‑rings at each end stop leaks. The hose also absorbs vibration so fittings and the evaporator core stay safe.

Why you need it

Without a healthy suction line, vacuum cannot be held during service, oil flow is disrupted, and the compressor may run noisy or hot. Proper flow equals faster pull‑down and steady vent temps.

What happens if it fails ⚠️

Symptoms include weak cooling, short cycling, hissing, oily residue at crimps, or dye traces. A cracked or porous hose lets moisture in, forming acids that scar the compressor and expansion valve. Left unchecked, it can cause compressor seizure.

Install tips 🧰

Use new, correct-size O‑rings with a light coat of PAG oil. Route away from heat and sharp edges. Evacuate to deep vacuum, then charge to the specified weight (R134a/R1234yf as applicable). Replace the receiver‑dryer if the system was open.

Compatibility

• Coaster