AC Performance Analyzer — The End-of-Line Test Station

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:

Multi-condition test sequences — capacity, duty cycle, sensor sweep — driven from a single PLC-orchestrated routine.
Per-unit signed report with all measured values, exportable to OEM traceability formats.
Statistical drift alarms — Cp/Cpk on key measurements per shift, per line, so quality trends surface before they become incidents.
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.

Frequently Asked Questions

What is end-of-line AC performance testing?

End-of-line AC performance testing validates every assembled automotive air conditioning unit against a multi-condition test sequence — refrigerant charge, compressor duty cycle, evaporator/condenser ΔT, sensor health, and acoustic signature — before the unit ships.

Why are standard functional tests not sufficient for automotive AC?

Standard tests are designed around anticipated failure modes. The expensive warranty failures are the ones that pass catalog-point tests but surface under real operating conditions — thermal cycling, long-duration compressor loads, or sensor drift that's within spec on day one and out of spec six months later.

What is Cp/Cpk used for in AC end-of-line testing?

Cp/Cpk runs on key measurements (refrigerant charge, ΔT, compressor current) per shift and per line. Statistical drift alarms fire when process capability falls below threshold — typically before a single unit would have failed acceptance — allowing correction before a defect batch is produced.

Can the MileSoft AC Performance Test station handle multiple product variants?

Yes. Acceptance bands and test sequences are configurable per part number through the station HMI. Engineering changes update the limits without requiring a hardware or software rebuild — the station validates which configuration it's loaded before each test cycle.

How does the AC test station integrate with ERP and material traceability?

Test results are automatically linked to the unit's VIN/serial in MileSoft Material Traceability and surfaced in the ERP production record. A fail event triggers an Andon alert and opens an NCR workflow — so the line doesn't process additional units until the fault is resolved.