How to Change a Coolant Temp Sensor on a 2007 Silverado

by Robert Moore

    The 2007 Chevy Silverado came with four different gasoline-powered engines; a 4.3-liter V-6, 4.8-liter V-8, 5.3-liter V-8 and a 6.0-liter V-8. The powertrain control module uses data from the coolant temperature sensor to control the temperature gauge on the dash and to trigger the cooling fans. Furthermore, the PCM uses information from the sensor to adjust air-to-fuel mixture. The sensor replacement process is the same regardless of engine, but the exact location of the sensor varies between the V-6 and V-8 engines.

    Items you will need

    • Wheel chocks
    • 3-ton floor jack
    • Jack stands
    • Safety glasses
    • Drain pan
    • Pliers
    • Deep-well socket set
    • Ratchet
    • Thread sealant
    • Torque wrench
    • 4 Gallons pre-mixed 50-50 Dexcool coolant
    Step 1

    Engage the parking brake. Set a pair of wheel chocks ahead of and behind each rear wheel. Lift the front end with a 3-ton floor jack and position a jack stand under each frame rail, just forward of the lower control arm mounting point. Lower the truck so it sits securely on the stands.

    Step 2

    Open the hood and put on safety glasses. Loosen the coolant reservoir cap one-quarter turn, wait for the hissing noise to dissipate and remove the reservoir cap. Slide a drain pan below the lower radiator hose. Squeeze the pressure clamp with pliers and slide the clamp up the hose. Pull the lower hose from the radiator and wait for the coolant to drain from the radiator and the hose.

    Step 3

    Attach the hose to the radiator and slide the clamp into place. Remove the drain pan and lower the truck to the ground. Find the coolant temperature sensor – on the V-6, it's between the rear spark plug wires on the driver's side cylinder head. On all V-8 engines, it's above the front spark plug on the driver's side. Squeeze the locking tab and remove the harness from the sensor.

    Step 4

    Remove the sensor from the cylinder head by turning it counterclockwise with a deep-well socket and a ratchet. Apply a coat of thread sealant to the threads of a new sensor, if thread sealant wasn't applied by the manufacturer. Thread the sensor into the cylinder head, then tighten the sensor to 15 foot-pounds with a torque wrench and deep-well socket. Connect the harness to the new sensor.

    Step 5

    Fill the cooling system through the coolant reservoir, using fresh 50-50 Dexcool coolant. Continue adding coolant until the level holds steady at the “Full Cold" line. Install the pressure cap and tighten it. Start the engine and hold the engine speed between 2,000 and 2,500 rpm until the engine reaches operating temperature -- when the needle on the temperature gauge is roughly in the middle of the gauge and the upper radiator hose is warm. Allow the engine to idle for three minutes after it reaches operating temperature, then shut it off.

    Step 6

    Allow the engine to cool. Rotate the reservoir cap one-quarter turn and wait for the hissing to dissipate. Remove the cap and top off the coolant reservoir. Install the cap and shut the hood. Take the used coolant to your local recycling center, repair shop or parts store for recycling.

    Warning

    • The Dexcool you're using is toxic. Always seal coolant containers and store them out of the reach of animals and children.

    References

    • Prodemand.com: 2007 Chevy Silverado 4.3-liter ; Components; Coolant Temperature Sensor
    • Prodemand.com: 2007 Chevy Silverado 4.8-liter, 5.3-liter and 6.0-liter ; Components; Coolant Temperature Sensor
    • Prodemand.com: 2007 Chevy Silverado; Fluid Capacities
    • Prodemand.com: 2007 Chevy Silverado; Service Manual; Static draining and Filling