AC Compressor Won't Engage - Disconnected Pressure Sensor Connector

Electricalbeginner✓ OP Confirmed

Problem

AC compressor would not engage at all. Engine idle speed remained unchanged when AC was turned on, indicating the compressor clutch was not activating.

AC compressor does not engageEngine idle does not increase when AC is switched onNo cold air from AC system

Root Cause

The pressure sensor electrical connection had come apart, likely pulled loose inadvertently while working nearby on intake hoses and distributor. Without the pressure sensor signal, the AC system would not allow the compressor clutch to engage.

Confidence

High confidence — Original poster confirmed this resolved the issue

View Original Thread →Posted March 2022 on SupraForums.com