Mercury Marquis Coolant Temperature Sensor

Starts Up, Drives And Shifts Fine When Engine Is Cold, But When It Warms Up, The Fan Turns/stays On. Then I'll Accelerate Normally And It'll...

My Car Decides To Overheat When I Am On The Pedal, As Soon As I Let Go Of The Gas It Lowers Back Down To Normal. I Have Changed The Radiator...