11/26/2025
Mobile mechanic call out. Usually we’d go to the offroad park to fix a rig, but today it was at the state park camp ground. These newer 5.3s are known for the coolant temp sensor failing and or wire damage at the plug. This will cause the engine fan to run at full rpm and stay on for a while after the engine is shutdown. This truck has had 2 aftermarket sensors installed within the last 10 months. Wiring is good, so an OEM sensor was installed.