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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1199 (HVAC - Climate Control System - General Information And Diagnostics - (Except Hybrid)) >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> Pinpoint Test M: The Air Conditioning (A/C) is Always On - A/C Mode Always Commanded ON >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

Under normal operation, when A/C is requested the HVAC module then sends an A/C request message over the Medium Speed Controller Area Network (MS-CAN) bus to the Instrument Cluster (IC), then from the IC  through the High Speed Controller Area Network (HS-CAN) bus to the PCM.

This pinpoint test is intended to diagnose the following: 

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