OEM 2003 Chevrolet Express 3500 Coolant Temperature Sensor

2003 Chevrolet Express 3500 Parts Questions & Experts Answers

• Q: How to replace the Coolant Temperature Sensor on 2003 Chevrolet Express 3500?

  A: Maintaining the Engine Coolant Temperature (ECT) sensor requires a shutdown of ignition systems before you handle the sensor and conduct operations with caution to defend against fuel control system impairment. Your first step should be to lift the vehicle and drain coolant fluid to a point beneath the ECT sensor. The sensor needs removal after disconnecting the ECT connector and clearing both the electrical and sensor connections. The ECT sensor threads must receive a coating made from GM P/N 12346004 (Canadian P/N 10953480) or a sensor-approved sealer. Use components matching the correct part number for the specified application but handle thread locking compounds along with lubricants sealants and corrosion inhibitors with care since they can affect final torque and operational performance of components. Tighten the ECT sensor to reach 20 N.m (15 lb ft). The engine needs a coolant refill and the ECT sensor electrical connector needs reinstallation.