WCS Autotecnica NI0617921 A/C Evaporator Temperature Regulator (ETR) Switch

The WCS Autotecnica NI0617921 is an aftermarket replacement A/C Evaporator Temperature Regulator (ETR) switch designed for Nissan vehicles. This critical air conditioning component monitors the temperature of the evaporator core and controls compressor clutch cycling to maintain consistent, efficient cabin cooling.

The ETR switch works by sensing evaporator temperature and signaling the compressor clutch to engage or disengage accordingly, preventing the evaporator from freezing while delivering steady cold airflow. Over time, original ETR switches can experience calibration drift or fail entirely, resulting in poor A/C performance, warm air from the vents, or compressor cycling issues — symptoms this direct-fit replacement is designed to resolve.

Key Features:

• Direct-fit OEM-style replacement for the original A/C ETR switch
• Monitors evaporator core temperature to regulate compressor clutch operation
• Helps prevent evaporator freeze-up and maintains consistent cooling output
• Manufactured to ISO/TS 16949 quality management standards
• Covered by Autotecnica's two-year, unlimited mileage warranty
• Plug-and-play installation — no modification required

Autotecnica is a trusted aftermarket supplier of precision-engineered replacement parts for Asian and North American vehicles, offering a reliable and cost-effective alternative to expensive OEM components.