you can bleed the air out by pressing the brakes on while you open the the brake fluid line up make sure you have the cap of the top off so you can get some pressure in the lines and next tim you change brakes leave the top off and you wont have to worry about air in the lines
IT MIGHT BE YOUR THE FAN OVERHEATING BUT WITH THAT MUCH INFO THERE ISNT MUCH TO SAY IF IS THE FAN IT SHOULDNT BE HARD TO REPLACE I KNOE SOMETIMES THOSE FANS OVERHEAT AND THAN SHUT OFF
HEY I PUT A NEW ENGINE ON MY DURANGO 99 THE ENGINE WAS A 2001 AND IT WAS PRACTICALY NEW NOW I DONT KNOW MUCH ABOUT THE COMPUTER BEING CALIBERATED IS IT NESSESARY TO DO THIS OR NOT DO I NEED TO GET THE ENGINE CALIBERATED OR WILL IT RUN BY JUST SWAPPING THE ENGINE RIGHT NOW IT RUNS OK BUT I KNOW...