The EGH-15M056 is an Electronic Expansion Valve (EEV) component utilized in the thermal management system of the Tesla Model 3, specifically within the "Supermanifold" assembly for vehicles equipped with a heat pump.
Component Overview
Role: This valve precisely regulates the flow of refrigerant into the evaporator or heat exchanger. Unlike mechanical valves, it uses 12V pulses to move an internal pin through hundreds of incremental steps, allowing for highly efficient climate and battery temperature control.
Part Numbers: While the specific manufacturer code is EGH-15M056, the official Tesla service part numbers often associated with Model 3 expansion valves include 1101878-00-A or 1501100-CL-C as part of the larger SuperManifold set.
Common Issues and Symptoms
A faulty expansion valve can lead to significant thermal management failures, including:
Loss of Cabin Heat: Software bugs or communication interruptions can cause the valve to trap refrigerant, leading to a "fail-safe" compressor stoppage, particularly in cold temperatures.
Poor AC Performance: Warm air blowing from vents or inconsistent airflow.
Alert Codes: Problems with the valve or its position sensing circuit may trigger vehicle alerts such as VCFRONT_a210.
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