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For a 2006, yes..... that would be the engine temp when the thermostat is regulating engine temp. For a 2003-2005, the thermostat will regulate at about 200-205. The difference is in the way the engine computer calculates and displays the engine temp. You will see this most clearly above 35mph, when the cooling fan is turned off by the computer (adequate natural airflow through the radiator allowed GM engineering to establish this point).
>>NOTE<<< Having a highway temperature (above 35mph) rise above 210 is NOT normal..... it is an indication of a problem in the system that is not an airflow issue. The exception is when climbing a hill (especially in hot weather) when your coolant temp will have a “normal” rise of 10-15 degrees.
You may see some temperature swings. They are normal. This is when the thermostat is wide open and the engine temperature is allowed to rise to the point of needing additional airflow.

If the A/C is off, the fan will go to low speed at 226 and then turn off at 219. High speed comes on at 235 and switches to low speed at 226.
>>NOTE<<< Having a temperature swing to 235 is NOT normal..... it is an indication of a problem.

With the A/C on, the fan will go to low speed when the A/C system pressure rises to “normal” range and then switch to high speed in the event that you have “higher than normal” system pressures. The exact numbers are a bit unimportant, as there is no way to measure it without a set of gauges on the system....

My two cents,

Mike
 

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For a 2006, yes..... that would be the engine temp when the thermostat is regulating engine temp. For a 2003-2005, the thermostat will regulate at about 200-205. The difference is in the way the engine computer calculates and displays the engine temp. You will see this most clearly above 35mph, when the cooling fan is turned off by the computer (adequate natural airflow through the radiator allowed GM engineering to establish this point).

You may see some temperature swings. They are normal. This is when the thermostat is wide open and the engine temperature is allowed to rise to the point of needing additional airflow.

If the A/C is off, the fan will go to low speed at 226 and then turn off at 219. High speed comes on at 235 and switches to low speed at 226.

With the A/C on, the fan will go to low speed when the A/C system pressure rises to “normal” range and then switch to high speed in the event that you have “higher than normal” system pressures. The exact numbers are a bit unimportant, as there is no way to measure it without a set of gauges on the system....

My two cents,

Mike
Mike major thanks for your clear narrative regarding the variable coolant temperature fluctuations.
 

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Discussion Starter #4
For a 2006, yes..... that would be the engine temp when the thermostat is regulating engine temp. For a 2003-2005, the thermostat will regulate at about 200-205. The difference is in the way the engine computer calculates and displays the engine temp. You will see this most clearly above 35mph, when the cooling fan is turned off by the computer (adequate natural airflow through the radiator allowed GM engineering to establish this point).


You may see some temperature swings. They are normal. This is when the thermostat is wide open and the engine temperature is allowed to rise to the point of needing additional airflow.

If the A/C is off, the fan will go to low speed at 226 and then turn off at 219. High speed comes on at 235 and switches to low speed at 226.



With the A/C on, the fan will go to low speed when the A/C system pressure rises to “normal” range and then switch to high speed in the event that you have “higher than normal” system pressures. The exact numbers are a bit unimportant, as there is no way to measure it without a set of gauges on the system....

My two cents,

Mike
 
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