thanks Steve
what i did today is to disconnect every thing that was i sight that might have any thing to do with the climate control system that includes the auxiliary pump,monovaleve ,and all four switch over valves , i then started the car and with in 3 minutes i could sense that the solenoids that are inside the pbc are getting hot( remember that in the first post i told you that i took the bottom cover of the bpc so that i can easily feel if it is getting hot) well.... with no other choice i resorted to an ancient method... i went to my 83 300D , got the pcb out, took the bottom cover off and started the engine and you guessed it.. this one gets very warm also..and its been working for years.. so.. what can i say..