Replacing the coolant temperature sensor on a GMC Acadia

Introduction

This tutorial will guide you through the process of replacing the coolant temperature sensor on a GMC Acadia, Chevy Traverse, or Buick Enclave. If your vehicle's temperature gauge is malfunctioning and the fans are running excessively, this could indicate a faulty temperature sensor. Replacing it is a straightforward task that can save you time and money.

Step 1: Gather Your Tools and Parts

Before you begin, make sure you have the following items ready:

• New coolant temperature sensor
• New sensor connector (if needed)
• 19mm socket and ratchet
• Wire cutters/stripper
• Butt connectors (often included with the new connector)
• Electrical tape
• Heat wrap (optional but recommended for durability)

Step 2: Access the Temperature Sensor

1. Locate the sensor: The coolant temperature sensor is typically found near the engine block, covered by insulation.
2. Remove insulation: Carefully pull back the foil insulation to access the sensor and its wiring harness. This may be somewhat challenging due to limited space.

Step 3: Disconnect the Old Sensor

1. Remove the plug: Press down on the latch of the connector to release it. Be gentle to avoid breaking it, as the latch is often fragile.
2. Unscrew the sensor: Use the 19mm socket to unscrew the old temperature sensor. Ensure you retrieve the washer that may come off with it.

Step 4: Install the New Sensor

1. Prepare the new sensor: Install the new coolant temperature sensor in the same location as the old one. Hand-tighten it first, then use the socket to secure it without over-tightening.
2. Connect the new plug: If you have a new connector, cut off the old one and prepare the wires:
   • Strip the ends of both wires from the new connector and the vehicle's harness.
   • Match wires according to orientation (the old plug’s wiring colors may not match).

Step 5: Splice Wires Together

1. Connect the wires: Use the butt connectors to splice the new connector wires to the vehicle's wiring. Ensure a secure connection.
2. Insulate connections: Wrap the connections with electrical tape to protect them from moisture and heat.

Step 6: Test the New Installation

1. Reconnect the battery (if disconnected): Before sealing everything up, reconnect the battery to power on the vehicle.
2. Test functionality: Start the vehicle and check if the temperature gauge is functioning properly and that the fans are operating normally.

Step 7: Finalize the Installation

1. Replace insulation: Once confirmed that everything works well, reposition the insulation back over the wires.
2. Secure everything: Make sure all components are properly secured and that no tools are left in the engine compartment.

Conclusion

Replacing the coolant temperature sensor on your GMC Acadia can resolve issues with the temperature gauge and fan operation, ensuring your vehicle runs smoothly. Always remember to test your connections before sealing everything back up. If you encounter any issues, double-check your wiring and connections. Happy driving!