AC Performance Test — End-of-Line Validation That Catches the Real Failures

End-of-line functional tests are everyone's favorite quality lever and most lines' biggest blind spot. The classic problem: you test for the failure modes you anticipated, you ship clean for the ones you didn't, and the warranty data three quarters later tells you which ones you missed.

A purpose-built AC Performance Test station exists to broaden the test envelope — without slowing the line.

What end-of-line AC testing has to cover

A defensible automotive AC functional test handles:

• Refrigerant charge verification with high-resolution mass measurement.
• Compressor duty-cycle behavior across the operating envelope, not just the rating point.
• Evaporator + condenser ΔT at calibrated airflow and ambient.
• Sensor health — every NTC, every pressure transducer.
• Acoustic signature — the failure modes that manifest as customer noise complaints.

How MileSoft handles it

The MileSoft AC Performance Test station provides:

1. Multi-condition test sequences — capacity, duty cycle, sensor sweep — driven from a single PLC-orchestrated routine.
2. Per-unit signed report with all measured values, exportable to OEM traceability formats.
3. Statistical drift alarms — Cp/Cpk on key measurements per shift, per line, so quality trends surface before they become incidents.
4. Integration with ERP, Andon, and Material Traceability so a failure event escalates and is genealogy-linked automatically.

Quietly important features

• Configurable acceptance bands so engineering changes don't require a station rebuild.
• Calibration management of the station's own sensors — auditor-recognized workflow.
• Cycle-time engineered for the actual line takt, not "close enough."

Where it fits

In a typical pokayoke + traceability stack:

• Pick-to-Light at the kitting bay.
• ADAS Radar Assembly for the radar product family.
• AC Performance Test for the AC product family.
• Material Traceability for the genealogy spine.
• Torque Traceability for fastener-critical sub-assemblies.

The takeaway

The expensive AC failures are the ones that look fine on the catalog test and surface in the customer's car. A purpose-built end-of-line station has the bandwidth to catch them.

Book a demo and let's walk through the test sequence we'd run on your specific product line.