How MAP-Controlled Thermostats Work and Why They Matter for Diagnostics
Modern vehicles have moved well beyond the simple wax-element thermostat. In this Tech Tip Short, Erik Screeden breaks down how MAP-controlled thermostat technology works — and why understanding PCM thermostat control is critical for accurate diagnostics. From managing engine coolant temperature under varying load conditions to diagnosing a thermostat heater circuit or thermostat performance code, this video covers what today's technicians need to know before replacing parts.
Whether you're dealing with an electrically assisted thermostat or a wiring issue on the control side, this Tech Tip Short is packed with practical insight. Watch the full video to sharpen your diagnostic approach and save time in the bay. Then visit www.autozonepro.com/ac for more information.
About the Author
Erik Screeden
Technical and Multimedia Content Director
Erik Screeden is the Technical and Multimedia Content Director for the Vehicle Service & Repair Group. Erik is an ASE Master Automobile Technician with L1, and L4 credentials, who has been in the industry for over 25 years in various capacities. During that time, Screeden was a technician. He started out at a Ford dealership and continued to several independent repair facilities as well as spent time in the specialty aftermarket at a GM-specific performance shop. After his time as a technician came to an end, Screeden transitioned into a role providing scan diagnostic and J2534 tool support. He was then able to parlay his experience as a technician and a support specialist and use that in several technical sales roles.
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