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That means the engine is overheating. Check in this ORDER.

First check coolant level in radiator, if low then Find and FIX the LEAK and refill the system with COOLANT. Check engine FAN clutch, Thermostat, Radiator making sure it is NOT stoped up. You will find your problem in these AREA.

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Q: What does reduced power engine mean on 2003 silverado?
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2003 Chevrolet Silverado loss of power?

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