Please note don’t wear any loose clothes, tie, pallu, etc while checking the under the bonnet. Do not open the radiator cap when the engine is hot
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The ID plate must be there and it should match with the chassis number punched on the body.
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Listen for any abnormal noise from the engine.
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Discolored coolant (faded), level of engine oil, brake oil, thickness of engine oil, A/C gas bubbling, floating sludge in the coolant & radiator.
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Leakage & damage of the ignition coil, hoses, chords, etc
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Visually check for the damage of fins of radiator & condenser.