Obvious Signs:
* Complete lack of engine cranking: This is the most obvious sign. The engine won't even turn over when you try to start it. You'll likely hear a grinding or clicking noise instead.
* Smoke: Significant smoke coming from the engine bay, possibly accompanied by burning smells (oil or metal).
* Visible damage: In severe cases, you might see external damage like bent connecting rods poking through the engine block (rare, but possible).
Less Obvious, but Still Warning Signs:
* Unusual noises: This is crucial. Listen for:
* Loud knocking or banging: This can indicate a connecting rod has failed or other internal components are colliding.
* Grinding or screeching: This can signify metal-on-metal contact.
* Unusual ticking or clicking: While not always indicative of a seizure, it can be a precursor or symptom.
* Loss of power: A sudden, complete loss of power while driving is a major red flag.
* Overheating: While overheating doesn't *always* mean a seized engine, it can be a contributing factor or a result of a seizure.
* Stiff engine: If you try to manually rotate the engine (e.g., using a wrench on the crankshaft pulley), and it's extremely difficult or impossible to turn, this strongly suggests a seizure.
* Low oil pressure: Lack of lubrication is a primary cause of seizures. A low oil pressure warning light is a serious warning.
Important Note: If you experience any of these symptoms, especially a complete lack of cranking or unusual loud noises, do not attempt to start the engine again. Continuing to crank a seized engine will cause further, and potentially irreparable, damage. Have it towed to a mechanic for proper diagnosis and repair.
