MY MAZDA 4.0 SEEMS TO HAVE AN AIR POCKET SOMEWHERE. I HAD A CRACKED HEAD. SO I HAD NEW HEADS ,NEW WATERPUMP, NEW RADIATOR, AND EVERY THING ELSE DONE THE GARAGE COULD THINK OF. SEEMS AS THOUGH IT STILL HAS AIR POCKET. TOP RADIATOR HOSE STILL COLASPES. WORK DONE BY PROFESSTIONALS.THEY CALLED FORD AND FORD SAID THERE USED TO BE SOME SORT OF KIT FOR THIS PROBLEM, BUT THEY NO LONGER SELL IT BECAUSE THEY HAVE NOT SEEN THIS PROBLEM IN YEARS. CAN YOU TELL ME WHERE TO GET SUCH A KIT, OR A PICTURE OF IT SO THIS GARAGE CAN MAKE ME ONE. FORD CALLED IT A BYPASS KIT. WHOLE TOP END HAS BEEN REDONE. WE ARE STUCK.