DIAGNOSIS + SERVICE PLANNING
Vehicle A/C Not Cooling: Recharge, Leak or Electrical Diagnosis?
A service workflow connecting pressures, compressor command, fans, sensors and leak testing.
PurposeFinding the cause instead of repeatedly topping up refrigerant.
Pressure tells a story only with operating context
High- and low-side pressure must be interpreted with ambient temperature, fan operation and compressor command.
- Record static and running pressures.
- Confirm condenser-fan operation.
- On variable-displacement compressors, evaluate control-valve command.
A recharge is not a leak repair
If refrigerant has escaped, finding the leak prevents repeated short-lived recharges.
- Use visual oil evidence plus appropriate electronic or dye leak testing.
- Inspect service ports and impact-prone condenser areas.
- Confirm refrigerant and oil type for the exact vehicle.
The ECU may intentionally disable the compressor
Engine temperature, fan faults, pressure plausibility or power-management conditions can block A/C operation.
- Check A/C request and permission status in live data.
- Compare pressure-sensor data with physical gauges.
- Resolve engine, fan or electrical faults that inhibit compressor operation.
RELATED TECHNICAL RECORDS
Evidence supporting the same decision
Service note
This guide does not provide a fixed price or vehicle-independent replacement order. Exact procedures, torque, fluids, calibration and high-voltage values must be matched to verified service information for the exact vehicle application.
Sources & freshness
Sources & freshness
Exact technical values, prices and failure rates are not invented without verified vehicle/manufacturer evidence.