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3.4 liter engine. lowspeed fan 217 degrees. high speed fan 230 degrees. 3.8 liter engine. lowspeed 212 degrees. high speed 221 degrees.

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Q: At what temperature does the cooling fan come on in my 2005 impala?
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What is the normal operating temperature of a 2005 Chevrolet Impala?

Under normal conditions the thermostat opens at 195 degrees. The water temperature will reach between230 to 235 degrees and the cooling fan will come on and cool down to around 200 degrees and then shut off.


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The engine temperature must reach 232-235 degrees in order for the cooling fans to come on. They will shut off at about 195-200 degrees. Also when the air conditioner is on the cooling fans automatically come on regardless of temperature.


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