the thermostat migh be bad or your heater core is cloged wich wont let the water go from the engien to the raiteator which migh not cool the engien
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A failed ECM can certainly keep an engine from starting, but it probably won't be responsible for overheating.
If your truck is overheating!!! Then check the upper radiator and lower radiator hose's , if the lower is cooler the the upper the either the thermostat is not opening or the radiator is clogged
Getting stuck in the snow and having your engine overheat is a very bad idea. You should turn the car off, let the engine cool, and call for a tow truck.
a 2002 Alero could have several problems causing the overheating. Thermostat, water pump, or clogged radiator issues are the most common causes of overheating.
In the radiator. 50/50 mix water & anti-freeze. (Note: anti-freeze is a strange name, because that stuff also helps keep your motor from overheating.)