After replacing the expansion valve, the AC compressor cycles on for 1.5 seconds then shuts off, requiring ignition cycle to restart, but no diagnostic codes indicate the root cause.

Existing scan tools cannot read the AC pressure sensor value on this vehicle, preventing diagnosis of whether the pressure switch is faulty or the PCM is incorrectly commanding the compressor off.

Severity

3Medium

Willingness to Pay

implied

Added

Jun 3, 2026

Workarounds Described

jumps the AC relay to force compressor on to verify system works

Implied Software Gaps

software that reads proprietary AC pressure sensor data via OBD-II to diagnose compressor cycling issues without a high-end scan tool

App Concept

AC Diagnostic Pro

A mobile app paired with a Bluetooth OBD-II adapter that reads proprietary AC pressure sensor data on Ford/Lincoln vehicles. It displays real-time high/low side pressures, evaporator temperature, and clutch command status, allowing mechanics to quickly identify if the issue is a faulty sensor, wiring, or PCM logic without a high-end scan tool.

Key Features

Reads real-time AC pressure sensor data via OBD-II on Ford/Lincoln vehicles
Displays compressor clutch command status and evaporator temperature
Logs data to identify intermittent failures
Provides guided diagnostic flowcharts based on symptom and data

Target Users: Independent mechanics and DIY enthusiasts working on Ford/Lincoln vehicles, especially those without dealer-level scan tools

Revenue Model: $19.99 one-time app purchase plus $9.99 for vehicle-specific diagnostic add-ons

Existing Solutions Mentioned

scanner that can read the pressure sensor value

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