well.....what exactly blocked the cooler lines?........whatever it is must have come from inside the tranny in the first place....like metal shavings or clutch material..... which means that the blocked cooler lines are more likely a RESULT of the problem , rather than the CAUSE of the problem..... but once it's baked down it's hard to say. One of the biggest causes of AOD failure is an improperly adjusted or broken TV (throttle valve) cable. that is not simply a 'kick down' cable like on many older automatics, it also controls the upshift points and firmness of the shifts.....if the cable is not adjusted right, the trans will slip, generating excess heat, which will in turn burn the tranny up.....and then all the burnt clutch material that flakes off can end up in the cooler lines.