Citroen Xsara Turbo Diesel , Fans Problem.

Before the problem started, this is the Data: 90C on hot day, without A/C 75C On hot day, With A/C Today, its 90C on hot day without A/C
95C on hot day with A/C the Fans are not working as they used to, its not Getting in to 12V Mode. only 9V works. But, sometimes if you press hard on the gas pedel, or turning on/off the car, they Get intoaction at 12V Speed. But quickly shutting down. I Tried Replacing The "Bitron" Unit, this is not solved the problem. once you putting the Brown Plug that is on the Thermostat house out, they works in 12V Mode. What can be the problem? Model: 1998 Engine : DHY
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