strauss042649

Does anybody know what temp the fans are suppose to come on in a stock 2000

k24556

The low speed cooling fan is commanded on when the coolant temperature reaches 108°C (226°F). It is turned off if the coolant temperature lowers to 104°C (219°F). The high speed cooling fan is commanded on when the coolant temperature reaches 113°C (235°F). It is turned off if the coolant temperature lowers to 108°C (226°F). When the A/C is on and the coolant temperature reaches 85°C (185°F), the low speed cooling fan will be turned on at vehicle speeds less than 56 kPh (35 mph).

Normal driving with driving speed that flows sufficient air across the radiator with the AC off, the coolant temperature with a factory thermostat is 190°F, The fans will be off. The factory setting will not let the first cooling fan come on until the coolant reaches 226°F.

The low speed cooling fans are controlled by the PCM based on the following inputs:

The A/C system
The Engine Coolant Temperature (ECT) sensor
The Vehicle Speed Sensor (VSS)
The PCM will turn the low speed cooling fans ON when any of the following conditions exist at idle:
Certain PCM Diagnostic Trouble Codes (DTCs) are set
ECT above 104°C (219°F) will enable low speed fans
A/C head pressure above 1510 kPa (219 psi)
Once the low speed fans are turned ON by Engine Coolant Temperature, the PCM will turn the fans OFF when that temperature has dropped about 6°C (11°F) . If the low speed cooling fans are turned ON by high A/C head pressure, the PCM will turn the fans OFF when the pressure has dropped to 1034 kPa (150 psi). The minimum ON time for the low speed cooling fans is 50 seconds.
When engine speed is above 3500 RPM for 12 seconds and the engine oil temperature is above 127°C (261 °F), the low speed cooling fans will be turned ON.

HIGH SPEED COOLING FANS

The High Speed Cooling Fans are controlled by the PCM based on the following inputs:
The A/C system
The Engine Coolant Temperature (ECT) sensor
The Vehicle Speed Sensor (VSS)
The PCM will enable high speed cooling for both fans when any of the following conditions exist:
Certain PCM Diagnostic Trouble Codes (DTCs) set
ECT above 109°C (228°F)
A/C head pressure above 1551 kPa (225 psi)
Once the high speed cooling fans are turned ON by the Engine coolant temperature, the PCM will turn the fans OFF when that temperature has dropped about 6°C (11°F) . If the high speed cooling fans are turned ON by high A/C head pressure, the PCM will turn the fans OFF when the pressure has dropped to 1241 kPa (180 psi). The minimum ON time for the high speed cooling fans is 26 seconds.

When driving/ cruising the engine should run close to what the thermostat is rated.

strauss042649

Temp seems high to me, is it ok to have a tuner set the setting lower like 210 & 225. Or is that a safe temp to run at

laurent_zo6

According to GM engineers, LS motor is built to run correctly at these temperatures.

k24556

The heat removal capacity of the radiator is matched to the heat generation needs of the engine for a broad range of driving conditions, including spirited driving and high performance driving.

If you keep the radiator clean and you don't have air in the top of the heads, and the pump and t stat are functioning properly, then a stock engine should last a long time with no change in the temp settings. After all there are thousands of C5 corvettes running around and the owners are either confident with the cooling system, or don't know enough to worry.

Having the DIC in front of you yelling out each degree of temperature is both good and bad. In my truck when hauling a trailer, the temps go up (LS2 engine) but I don't notice because of no DIC. IF you are on the track, set your DIC to oil temp and just watch the water temp gage on the IPC. Continued oil temps above 270-280 can break down 5W30 Mobil 1 oil. Don't worry at all for oil temps 250 and below.

if you goose up the engine (mods) then more heat is generated, and just settings may not be enough because the engine heat removal needs exceed the capacity of the radiator.