car comfort charging of the pcm evaporator can be delayed or avoided by overriding blower voltage to a higher level than the default setting at the higher flow rate the refrigerant temperature will be elevated along with the eoat temperature such that when this condition is met with control it ensures that no charging of pcm will occur and the highest amount of cooling enthalpy will be delivered to the passenger compartment fig5 provides the flowchart for managing the pcm evaporator charging during the transient phase of the a c system operation the flowchart commences with entering transient pcm charging at step 46 which flows to logic step 48 if the transient comfort has priority over pcm charging flow passes to step 50 providing override to higher blower voltage vhigh to bypass pcm charging and passes on to exit step 52 if the transient comfort does not have priority over pcm charging flow passes to logic step 54 if pcm charging does not have high priority flow passes to step 56 where normal acc system prevails and passes on to exit step 52 if pcm charging has high priority it flows to the step 58 of overriding acc to lower blower voltage vlow to improve pcm charging and passes to exit step 52 for systems without series reheat reduction srr and under low to mid ambient temperatures the refrigerant temperature may be naturally below the freezing temperature of pcm and meeting the condition of then charging will automatically occur the state of charge is tracked with f p once charged the pcm evaporator will remain charged and.