ACDelco Engine Coolant Temperature Sensor G1852 (12334869) Gold-line 0.840in Thread 100–220°F

Why does the coolant temperature sensor matter for your car?

How does the G1852 affect engine performance and diagnostics?

The coolant temperature sensor provides the engine control unit (ECU) with the temperature data needed to adjust fuel delivery, ignition timing, and to monitor emission controls. A correct reading prevents rough cold starts and supports efficient engine operation across temperature ranges.

• Accurate temperature input for ECU adjustments and diagnostics
• Helps maintain proper fuel-air mixture during warm-up
• Supports emission control and onboard diagnostic systems

What are the key specifications and what do they mean?

The G1852 is specified for a thread diameter of 0.840 inch and is calibrated across a typical operating range from approximately 100°F to 220°F. Those values indicate the sensor’s mechanical fit and its effective temperature span for normal engine operating conditions.

• Thread diameter: 0.840 inch — matches compatible sensor ports
• Operating temperature range: ~100°F to 220°F — suitable for most gasoline engines
• Gold-line quality — upgraded materials and testing versus economy replacements

How easy is it to install and test the replacement sensor?

Installation is straightforward for anyone comfortable with basic automotive tasks: drain minimal coolant if required, remove the old sensor, install the ACDelco unit with a proper sealant or new gasket, and reconnect wiring. After installation, verify operation by checking ECU live data or confirming correct gauge movement and fan operation.

• Simple hand tools required—wrench/socket for 0.840-inch thread
• Minimal coolant loss with cautious removal and reuse of drained fluid when possible
• Verify using scan tool live data or observing correct fan and gauge behavior

Will this sensor fit my vehicle and replace the OEM part?

The ACDelco Gold G1852 is manufactured to match the fit, form, and function of original equipment sensors, but always confirm vehicle-specific compatibility using the OEM part number or fitment guide. Correct thread size and electrical connector type are essential for a proper replacement.

• Designed as an aftermarket direct-replacement part
• Confirm fitment against OEM number 12334869 or vehicle application guides
• Check connector style and mounting port dimensions before purchase

Who is this for: The ACDelco Gold G1852 suits DIY mechanics, independent shops, and fleet technicians seeking a dependable aftermarket coolant temperature sensor that mirrors OEM quality. It’s ideal for vehicles requiring the 0.840-inch threaded sensor with the specified temperature calibration, and for anyone prioritizing durable components that support engine management, HVAC fan control, and accurate dash readings.