Hello all!!

2008 RRS 4.2L SC

I keep getting a P0128, Coolant Temperature Below Thermostat Regulating Temperature.

What I have done;
Changed the T-Stat three times
Changed the coolant temp sensor
Replaced the radiator
Replaced the heater core
Replaced the overflow bottle
Tested the electro-viscous fan and confirmed it is operating correctly
Complete and thorough flush of the cooling system
Vacuum filled the cooling system

Yet the P0128 continues to plague me.

I have read about a second thermostat or an Oil Cooler Mixer Valve (OCMV) and I can find this part easily for the HSE (non supercharged models) but I cannot find it for my supercharged model. Does it exist in the supercharged model? And if so does anyone know the part number?

If it does not exist, what am I missing??

Thanks for the help!!

 

On the V6 SC engine, there is a coolant temp sensor in the rear crossover pipe at the back of the engine, and another in the lower radiator hose just below the T-stat. I imagine the V8 supercharged is similar, but not sure.