GM Original Equipment Engine Sensor ACDelco® 12641073 - GM Original Equipment™ Engine Coolant Temperature ACDelco 213-78 Engine Temperature Sensor The engine temperature signal is used by the engine control module to adjust the air/fuel mixture and ignition timing. ACDelco® 213-77 - GM Original Equipment™ Engine Coolant Temperature Sensor Manufactured to GM OE specification for fit, form, and function M-ENGCOO Shop All ACDelco ACDelco 5564 5.0 Write a review Part # 213-78 SKU # 5564 An ACDelco GM Original Equipment Engine Coolant Temperature Sensor monitors the engine temperature, and is a GM-recommended replacement for your vehicle’s original component. ACDelco 213-78 Radiator Cross Reference International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.