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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 996 (Climate Control System - General Information And Diagnostics - (Hybrid)) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test G: The Air Conditioning (A/C) is Always On >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

Under normal operation, voltage is supplied to the A/C low charge protection switch through circuit CBB29 (WH/VT). When the A/C low charge protection switch is closed (ON), voltage is sent to the dual-function pressure switch through circuit CH422 (VT). When the dual-function pressure switch is closed (ON), voltage is provided to the PCM. Ignition voltage is provided to the A/C clutch relay switch through circuit SBB13 (GY/RD). When A/C is requested, a message is sent over the MSCAN bus to the PCM. When the PCM energizes the relay, ignition voltage is supplied to the A/C clutch through circuit CH401 (VT/WH). Ground is supplied for the A/C clutch through circuit GD120 (BK/GN).

This pinpoint test is intended to diagnose the following:

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