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· one wheel drive
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The coolant temp sensor and thermostat don't have much to do with eachother. In the 00-02 ECT does two things
-tells the PCM the engine temp for fuel calc
-through the PCM feeds the instrument cluster a damped version of engine temp

There are separate switches for the radiator fans.

You need to check the wiring of the ECT to PCM and the functioning of the ECT either through a scanner or removing it and putting it in hot water and following the service manual for resistance readings at certain water temp

I'd look at wiring or the crappy aftermarket parts you're putting on. 15 degrees is no big deal
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