One of the top-shelf A/C classes being taught at MACS 2020 Training Event is the challenge of change in mobile A/C with Peyter McArdle of Four Seasons. A myriad of changes to systems design and operation over the past ten to fifteen years can make diagnosing and repairing a modern air conditioning system diabolically difficult. The greater use of computer controls including volume flow sensors, eVDCs (electronically controlled variable displacement compressors), electro-viscous fan clutches, evaporator thermistors, multi-speed cooling fans, active grille shutters, dual zone systems etc. can really darken your diagnostic day. Couple these technologies with changes in basic component design such as the use of flat tube, multi-pass, multi-path flow, sub-cooling condensers, idle stop evaporators, oil retention compressors etc. and it can be overwhelming to know where to begin your diagnosis of a poorly performing system.
“Join us for this class at MACS 2020 when we will explain some of these changes in detail and their impact on system operation and diagnostics. We will look at some of the issues and failures associated with these technologies and how best to cut to the diagnostic chase.”