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Home >> Lincoln >> 2009 >> MKX FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 933 (Climate Control System - General Information And Diagnostics) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test D: The Air Conditioning (A/C) Is Always On >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

Under normal operation, the function selector switch is supplied voltage through circuit CBP27 (GN/BN). When any mode requiring A/C is selected, the function selector switch sends voltage to the A/C high pressure switch through circuit CH443 (GN/OG). Voltage is then supplied from the A/C high pressure switch to the A/C cycling switch through circuit CH423 (YE). The voltage is then supplied from the A/C cycling switch to the PCM through circuit CH425 (GN/BU).

Voltage is supplied to the A/C clutch relay switch through circuit SBB25 (RD). When the relay is energized, voltage is sent to the A/C clutch through circuit CH401 (VT/WH). The A/C clutch is grounded through circuit GD121 (BK/YE).

Possible Causes

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