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Refrigerant compatibility is a system decision, not a label on one replacement part. Match the refrigerant, compressor model, controls, lubricant, seal and gasket materials, hose and fitting design, pressure range, service equipment and vehicle procedure as one controlled package. A lower-global-warming-potential gas still requires the compressor and sealing system to be specified for that application.
This guide helps commercial-vehicle buyers organize that compatibility review around the compressor and clutch applications served by Weili, including Valeo TM65, Thermo King X426/430, Hispacold and Bitzer/Bock compressor families.
Compressor and clutch applications to identify first
Weili product material identifies commercial-vehicle compressor-clutch applications associated with Valeo TM65, Thermo King X426/430, Hispacold and Bitzer/Bock compressor families for bus and truck programs. Use the complete compressor reference, clutch voltage, pulley geometry, hub, connector and control details to identify the correct configuration.
| Application input | Why it matters |
|---|---|
| Complete compressor model | Sets the approved displacement, ports, control and operating envelope. |
| Clutch and pulley data | Controls voltage, coil, pulley diameter, grooves, offset, hub and air gap. |
| Fluid package | Links the approved refrigerant, oil, seals, hoses and service procedure. |
| Vehicle duty | Confirms ambient range, condenser airflow, route load and service access. |
A compatible replacement is released only when the mechanical, electrical and fluid package is matched to the same application revision.
Use a complete compatibility chain
| Layer | Questions to answer | Evidence to request |
|---|---|---|
| Refrigerant | Which exact refrigerant designation, blend, purity and pressure class is specified for the vehicle? | Vehicle/AC-unit service information and approved refrigerant label. |
| Compressor | Which make, full model, displacement/type, control valve, ports, rotation and operating envelope are approved? | Compressor datasheet, nameplate, application list and change-control revision. |
| Lubricant | Which oil chemistry, viscosity, quantity, miscibility and fill procedure are specified? | Compressor or vehicle maker oil instruction and supplier confirmation. |
| Seals and gaskets | Which elastomer, coating, size, hardness and temperature/pressure limits are approved? | Material declaration, seal compatibility statement and exact seal kit identification. |
| Service equipment | Are recovery machine, hoses, gauges, vacuum pump, scales and labels dedicated or cleaned for the gas? | Workshop procedure, equipment certification or manufacturer instructions. |
| System interfaces | Are hoses, barrier layers, fittings, service ports, driers and valves compatible? | System drawing, parts list and inspection or validation record. |
If any layer is unknown, pause the purchase decision. “Same compressor size” or “same O-ring shape” is not evidence of compatibility.
Do not turn a refrigerant change into a parts-by-appearance swap
Compressor identification comes first
Record the complete compressor reference, not only the vehicle model. Weili lists application-specific clutch references such as a 24 V clutch for Valeo TM65 and a 24 V bus clutch for Thermo King X426/430. These references help identify the mechanical and electrical application, but they do not by themselves establish which refrigerant or oil the compressor may use.
Seal material must follow the approved fluid package
A seal must be selected by compound, size, temperature, pressure, refrigerant, lubricant and installation method. Do not infer material from color or from a seal supplied for another compressor family. Ask for the exact kit or material declaration tied to the proposed gas and oil combination.
Service contamination is a compatibility risk
Shared hoses, recovery cylinders, gauges and charging equipment can contaminate a system or create a wrong-gas event. The workshop procedure should identify, label, isolate and recover the refrigerant correctly before any compressor, clutch, seal or hose work.
Evaluate a new gas with a gated process
- Freeze the exact refrigerant designation and the vehicle or AC-unit approval source; do not use a marketing name alone.
- Identify the complete compressor, clutch or control-valve configuration and record the current oil, charge and seal references.
- Request written compatibility evidence for compressor, oil, seals, hoses, driers, valves and service equipment from the responsible manufacturer or supplier.
- Inspect the vehicle system for the existing gas, contamination, leaks, damaged hoses, incorrect oil or non-approved conversions.
- Run a controlled sample or prototype evaluation with defined pressure, temperature, leakage, electrical, noise and cooling checks.
- Approve the exact part numbers, materials, charge procedure and service labels by revision; control any substitution or formula change.
- Record field results and claims by vehicle, compressor revision, gas, oil and seal kit so a later failure can be traced.
A conversion is not approved because a compressor turns on or the vents feel cool for one test. The release decision must cover durability, leakage, service safety, component protection and the documentation needed by the next technician.
Compatibility checks for compressors and clutches
- Confirm compressor model, mounting, ports, rotation, displacement/type, control method and clutch or pulley interface.
- Match nominal voltage, coil, connector, pulley diameter, grooves, offset, hub and air gap for a clutch application.
- Confirm the compressor maker's refrigerant, oil and seal instructions for the proposed gas.
- Check condenser and evaporator capacity, fan operation, pressure controls and protection strategy after any refrigerant change.
- Ask for sample identification, inspection records, lot traceability and change notification for production parts.
Keep the compressor, clutch, fluid package and service procedure tied to the same controlled application specification.
Compatibility checks for seals and service kits
- Use the exact seal location and dimensions: shaft, housing, port, flange, service valve or hose connection.
- Confirm elastomer or gasket compound, coating, temperature range, pressure range, refrigerant and oil exposure.
- Check storage age, packaging, surface damage, lubrication during installation and torque or compression requirements.
- Replace related driers, filters or contaminated parts only when the approved procedure calls for them; record the reason.
- Leak-test the repaired system with the specified method before charging, then record the gas, oil and seal kit revision.
Release a seal kit only when its compound, dimensions and fluid exposure are defined in the approved service or purchasing specification.
A practical RFQ checklist for modern gases
Send the supplier a package that makes the compatibility question answerable:
- Vehicle and AC-unit make, model, year or platform revision, and operating region.
- Complete compressor nameplate and clutch or control-valve reference; include clear photos and dimensions.
- Current refrigerant, proposed refrigerant, current oil, proposed oil and any conversion history.
- Seal or gasket location, size, material if known, leak history and service procedure.
- Operating pressure and temperature targets, electrical voltage, condenser fan and blower configuration.
- Annual quantity, prototype need, destination, required documents, traceability, change-control and warranty expectations.
Use the Weili contact route for the application review and the product catalog to identify candidate commercial-vehicle component families. Ask the response to identify the approved configuration, supporting documents and any application-specific checks required before release.
Frequently asked questions
Does a lower-GWP refrigerant work with any commercial AC compressor?
No. Confirm the compressor model, pressure envelope, controls, oil, seals, hoses, driers, valves and vehicle approval. Lower GWP is an environmental characteristic, not a universal compatibility certification.
Can I use the same seals after changing refrigerant?
Only when the responsible manufacturer or supplier confirms the exact seal compound, size, oil and refrigerant combination. Appearance or color is not sufficient evidence.
Does a Weili compressor clutch listing confirm refrigerant compatibility?
No. A clutch listing helps identify a mechanical and electrical application such as Valeo TM65 or Thermo King X426/430. Refrigerant, oil and seal approval must still come from the compressor or vehicle documentation and the supplier response.
What oil information should be requested?
Request oil chemistry, viscosity, quantity, miscibility, fill procedure and any flushing or recovery requirement for the exact compressor and refrigerant. Do not rely on a generic “AC oil” description.
What should I ask Weili before ordering a component for a new gas?
Send the complete compressor and vehicle application, current and proposed refrigerant, oil and seal information, component part number, required test documents and service conditions. Ask Weili to identify verified scope and any items that must be confirmed by the compressor or vehicle maker.