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Originally Posted by BrandonMods
I was curious if anyone knows if there is an OEM document out on the interweb or a website with information concerning the radiator fan activation temperature? If not could using an led in series with the radiator fan relay work to determine activation temperature?
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On my car (06 GP 3800 Series III L26. ) the operating temperature range 194 to 225. The cooling fans with the air off won't come on until the temp reaches 220 degrees then turn back off at 197 degrees via the u gauge. So the below information seems accurate for the 3.1L or 3.4L V-6 Engine (VINs J, E - RPOs LG8, LA1)
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The PCM commands Low Speed Fans on under the following conditions:
Engine coolant temperature exceeds approximately 106°C (223°F).
A/C refrigerant pressure exceeds 1310 kPa (190 psi).
After the vehicle is shut off if the engine coolant temperature at key-off is greater than 140°C (284°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.
The PCM commands High Speed Fans on under the following conditions:
Engine coolant temperature reaches 110°C (230°F).
A/C refrigerant pressure exceeds 1655 kPa (240 psi).
When certain DTCs set.
Engine Coolant Indicators
Engine Coolant Temperature
The IPC illuminates the engine coolant temperature indicator when the body control module (BCM) determines that the coolant temperature is greater than 123°C (253°F). The BCM receives a class 2 message from the PCM indicating the coolant temperature. The BCM sends a message to the IPC via the class 2 requesting illumination.
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Engine temperature - Car Forums and Automotive Chat
I believe the factory thermostat is 195