1. Start with the refrigerant (medium)

The R134a hot sale auto air conditioning hose with good quality listing gives these compatible refrigerants: R12, R134a and R404a. Its features include R134a refrigerant resistance and low permeability.

If the vehicle uses R1234yf, this hose's listing does not cover that refrigerant, so this recommendation does not apply. The company's E Type factory air conditioning hose says it is designed to meet automotive OEM requirements for R134a and the next-generation R1234yf refrigerants, and its features list resistance to R404a, R134a, R12 and 1234yf. Its data table also includes a QRT-DL series labelled "1234yf". The "Refrigerant" line in the same listing names only R12, R134a and R404a, though. Buyers should ask for written confirmation of R1234yf compatibility before ordering.

2. Choose a structure and wall type

The R134a hose listing describes the Type C A/C hose in two structures:

• Braided: 5 layers
• Spiral: 7 layers

Its parameter tables cover three series: Type C thin wall (A10), Type C thick wall (A20) and QRT-JL (R134a). The inner diameters within each size are similar across the series. The outer diameters are different, so check the clearance and the fitting or ferrule requirements on the existing assembly before choosing a series.

3. Match the dimensions

Published data for the R134a hose (inner diameter / outer diameter, mm; working pressure / burst pressure, MPa):

The E-type hose listing gives a wider range of sizes, from 5/16" (8.2 mm ID) up to 3/4" (19 mm ID), including 7/16" (11.5 mm ID). This is useful when a repair calls for a size outside the four standard sizes above.

Both listings say their specifications are for reference only and that sizes can be produced to specific requirements. Confirm the final dimensions in writing.

4. Check the operating conditions

Both listings name the same application: air conditioning systems in cars, trucks and engineering vehicles. The R134a hose listing gives these performance claims: pulse resistance, aging resistance, ozone resistance, shock resistance and low permeability. If your system runs outside the published pressure or temperature range, neither listing supports that use.

5. Packaging and order details

Both listings give packaging of 50 m or 100 m per roll and say customized packing is available. The listings do not include pricing. Confirm lead time, current certificate validity and documents for your target market directly with the supplier. This article does not promise any of them.

What this guide does not cover

The source materials do not include fittings, crimping specifications, assembly instructions, evacuation or recharge procedures, or refrigerant handling safety limits. Work on refrigerant circuits should follow the vehicle manufacturer's service information and local regulations, and be carried out by qualified technicians.

Quick selection checklist

1. Refrigerant: R12, R134a or R404a points to the R134a hose. R1234yf needs the E-type hose, after written confirmation.
2. Size: match the inner diameter and the outer diameter, and check that the outer diameter suits the fittings.
3. Series: thin wall A10, thick wall A20 or QRT-JL, depending on space and assembly requirements.
4. Conditions: 3.5 MPa working pressure and -40°C to +135°C.
5. Order terms: confirm price, lead time and documents in writing.