Question about 2001 Pontiac Sunfire

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Check engine light comes on when you turn on the heat?

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Most likely the engine is falling below its normal operating temp, replace the thermostat and clear the code.

Posted on Sep 16, 2010

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Check engine light


Check levels if fine and not over heating clear the engine light sometimes changes in level will trigger it. If light comes on again after adding fluid. Then you know its something further but unlikely if it hasn't been over heating. If your losing fluid you might want to check around pump to make sure gasket seal is still good or check and make sure plastic turn opening valve on bottom of radiator isn't loose.

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Someone else's code may not help you as the light could come on for a number of reasons. Smoke under your hood could be due to a leak or leaks such as oil, coolant, power steering fluid and so on and as the engine gets hot the fluids will burn off on the hot engine or exhaust causing it to smoke. The smell when you turn the heat on could be because your heater core is leaking. This would be accompanied with low coolant levels, overheating and low heat especially at idle also the carpet may be wet. If your vehicle is equipped with a cabin air filter the smell could also come from there as leaves and other debris and sometimes even rodents can get in there. Also if you don't allow you evaporator to dry by shutting off the ac but letting the fan run for a couple of minutes the water on the evaporator can cause mold and mildew to grow giving you a funny smell as well. Hope this helps.

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