NOVELTY - A composite cooler/flow field plate assembly for a liquid electrolyte fuel cell comprises uniformly consistent mixture of 80-85 wt.% flake graphite, balance polymer binder, having fuel cell reactant gas flow field channels extending into its opposite major surfaces, with a coolant tube array (18) embedded between the flow field channels of one of the surfaces and the flow field channels of the other of the surfaces, where the composite plate is devoid of any acid edge protection layer or film, and is devoid of any graphite or carbon acid impervious separator plate.    USE - As composite cooler/flow field plate assembly for a liquid electrolyte fuel cell (claimed).    ADVANTAGE - The monolithic fuel cell cooler assembly has a single consistent composition throughout which resists acid absorption sufficiently to render acid impermeable graphite or carbon separator plate and edge layers unnecessary, and permits integration of reactant gas flow fields with the cooler plate; and devoids of acid-resisting graphite or carbon separator plates or layers adjacent to the reactant flow fields.    DETAILED DESCRIPTION - A composite cooler/flow field plate assembly for a liquid electrolyte fuel cell comprises uniformly consistent mixture of 80-85 wt.% flake graphite, balance polymer binder, having fuel cell reactant gas flow field channels extending into its opposite major surfaces, with a coolant tube array (18) embedded between the flow field channels of one of the surfaces and the flow field channels of the other of the surfaces, where the composite plate is devoid of any acid edge protection layer or film, and is devoid of any graphite or carbon acid impervious separator plate between the coolant tube array and the reactant gas flow field channels of either of the major surfaces. An INDEPENDENT CLAIM is included for preparing composite cooler/flow field plate assembly involving depositing a first volume of a mixture of 80-85 wt.% flake graphite, balance polymer binder, in the bottom of a mold; placing a coolant tube array on the first volume; depositing a powder of the mixture around and above the coolant tube array; depositing a second volume of the mixture on top of the powder; placing a mold plunger on top of the second volume; heating the content of the mold to above the melting temperature of the polymer binder under a pressure of 625 psi (4311 kPa); cooling the content of the mold to at least the solidification temperature of the polymer binder while still under the pressure; cooling the content of the mold to about room temperature; and disassembling the mold and removing the molded composite plate assembly from the mold.    DESCRIPTION OF DRAWING(S) - The figure shows view of the mold.    Mold (8)    Base (9)    Rail (10)    Preform (15)    coolant tube array (18)