F4 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE
Is the heater core outlet hose temperature similar to the inlet hose temperature (within approximately 6-17°C [10-30°F])?
Yes | DIAGNOSE for a temperature door actuator not operating correctly. For inadequate temperature out of the driver side, GO to Pinpoint Test I For inadequate temperature out of the passenger side, GO to Pinpoint Test J | |
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No | INSTALL a new heater core. REFER to: Heater Core (412-00 Climate Control System - General Information, Removal and Installation). | |
The A/C Is Inoperative
Refer to Wiring Diagrams Cell 55 for schematic and connector information.
Normal Operation and Fault Conditions
Control System Logic REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).
Possible Sources
Wiring, terminals or connectors Communication network Ambient Air Temperature (AAT) sensor A/C pressure transducer Evaporator temperature sensor Electric cooling fan Intake Air Temperature (IAT) or other temperature sensors Active grille shutters FCIM PCM
Visual Inspection and Diagnostic Pre-checks
Inspect BJB fuses 23 (10A) and 42 (15A).
PINPOINT TEST G : THE A/C (AIR CONDITIONING) IS INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
G1 CHECK THE A/C (AIR CONDITIONING) SYSTEM PRESSURE
Ignition OFF. With the R-134a manifold gauge set connected, check the A/C system pressure.
Is the A/C system pressure above 290 kPa (42 psi)?
Yes | GO to G2 |
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2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.