I finally fixed the problem. It wasn't the Water pump, or the Fan switch or the Green Temp Switch or the Fan Control Module but the "BLACK" NOT White, 2 Pin Thermal Switch 112c" It does sit in between 3 collant hoses where the upper radiator hose comes together with 2 smaller hoses. Kinda looks like a peace sign and in the center sits the 2 Pin Thermal Switch. It's not a AC Cut off switch which even the dealer tried to sell me and which I actually ordered from ECS tuning. The AC Cut out switch is "White" and even thou looks the same in size and form will not fix the issue. I was able to read the part number off the old switch which is 357919369F which when I looked it up on the ECS tuning web site did bring me to the right switch. Black with a green stripe on the top rim. I ordered that baby and it came in yesterday. Took the White switch out and put the Black switch in and guess what the fans no longer turn on when the ignition is in position 2 and now the fans come on when they are suppose to and don't sound like a jet engines afterburner. Simple 20 dollar part solved the problem. I think a lot of people are getting the wrong part from the dealer since this part is very hard to find. Everyone I asked wanted to give me that white sensor AC cut out switch but that isn't it. Here is the link to the correct switch hopefully it will help someone avoid a bit of frustration. http://www.ecstuning.com/Search/357919369F/ES248948/
Check your fuse box on top of your battery. They are notorious for having a short circuit, your fuse closest to the passenger side may be burned.
I have the same exact problem and it's not any of the fuses on top of the battery or in the side of the door. The only two things I haven't switched out yet are the fans itself (which I hear the resistor/thermostat inside are prone to fail) and the High Pressure/Low Pressure A/C switch which if it is faulty it sends a wrong signal to the ECM that the AC pressure is high and therefore turns on the fans to High. I see a lot of people having this issue on several different forums but I never have seen a definite solution to this issue. Everyone seems to switch out parts and parts but the problem exist. It's not the Fan Control Module, Not the fuses, not the Coolant Sensor, not the Temp Sensor, not the fan switch. So what else can it be but the fans themselves. It is really too bad that in these high tech times that even dealers can't find an issue without having to replace all these expensive parts to maybe get it right one day. Very sad indeed and what a racket.
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A/C refrigerant pressure exceeds 1 310 kPa (190 psi).
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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 BCM and PCM/ECM command High Speed Fans on under the following conditions:
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Engine coolant temperature reaches 110?°C (230?°F).
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A/C refrigerant pressure exceeds 1 655 kPa (240 psi).
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When certain DTCs set.
The three relays are located in the under hood fuse / relay box ! You need to have it checked for DTC'S -diagnostic trouble codes ! An you need a GM Tech 2 scan tool !
This diagnostic procedure supports the following DTCs:
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DTC P0480 Cooling Fan 1 Relay Control Circuit
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DTC P0481 Cooling Fan 2 and 3 or S/P Relay Control Circuit
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DTC P0691 Cooling Fan 1 Relay Control Circuit Low Voltage
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DTC P0692 Cooling Fan 1 Relay Control Circuit High Voltage
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DTC P0693 Cooling Fan 2 and 3 or S/P Relay Control Circuit Low Voltage
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DTC P0694 Cooling Fan 2 and 3 or S/P Relay Control Circuit High Voltage
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