ACDelco 84619421 GM OE Engine Coolant Temperature Sensor

The ACDelco 84619421 is a GM Original Equipment Engine Coolant Temperature (ECT) Sensor, manufactured to meet the same specifications as the factory-installed component. Designed for use in General Motors vehicles, this sensor monitors coolant temperature and sends data to the engine control module (ECM) to help regulate fuel delivery, ignition timing, and emissions control systems.

Key Features:

• GM Original Equipment — engineered and validated to GM OE specifications
• Monitors engine coolant temperature and transmits data to the ECM
• Helps ensure accurate fuel trim, ignition timing, and fan control
• Direct OEM replacement for a precise, trouble-free fit
• Manufactured by ACDelco, the official GM parts brand

As a direct-fit OEM replacement, the ACDelco 84619421 coolant temperature sensor restores factory performance and helps prevent issues such as rough idle, poor fuel economy, or incorrect temperature gauge readings caused by a faulty sensor.