* Unusual Noises: Listen carefully for unusual ticking, tapping, or slapping noises from the engine, especially at idle or when starting. These could indicate the belt is wearing or starting to slip. However, many noises can mimic this, so it's not a definitive sign.
* Rough Running Engine: The engine might run roughly or have difficulty starting. This is a more general symptom and could be caused by many problems.
* Check Engine Light: While not directly indicating a timing belt problem, a check engine light should *always* be investigated. It could indicate a related problem that might eventually impact the belt.
* Visible Wear or Damage (during inspection): If you're comfortable inspecting the belt yourself (it's typically located under a cover on the engine), you can check for cracks, fraying, glazing (shiny, smooth surface), or missing teeth. However, DO NOT attempt this unless you are experienced in auto mechanics. Incorrectly removing the cover can cause engine damage.
The most common indicator of a failed timing belt is a complete and sudden engine failure. The engine will stop running, and it will likely not restart. This is because the timing belt synchronizes the crankshaft and camshaft, and a broken belt means the valves and pistons are no longer timed correctly, leading to potentially serious internal engine damage (bent valves are a common result).
Crucially, a Chevy Tahoe's timing belt should be replaced at the intervals specified in the owner's manual. This is preventative maintenance and far cheaper than the cost of engine repair or replacement due to a broken belt. Ignoring the recommended replacement interval is a recipe for disaster. If you're unsure when the belt was last replaced, err on the side of caution and have it checked by a mechanic.
