Clinton was giving advice to help his old pal and solve the impasse...except Bill didn't want the impasse solved.
What Bill thought was that Chirac and Schroeder would lure Bush into working with the UN, and that they could humiliate the US and keep us tied up forever in Blixomania.
This was not an effort to help Blair, but rather one to sabotage Bush (Blair would have been collateral damage).
I am also certain that Bush knew that Clinton was talking to Blair.