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backwash your heater core. there are two heater hoses usually 3/4 inch i.d. find out witch one is the return and disconnect both. then take a hose and pressurize the return to flush out core. good luck
well let me tell you a easier way!! just cut the metal piping off! with a saw saw or a hack saw or tubing cutter and back of the motor where it screws in? unscrew that portion of the tubing and go buy a 1/2 pipe fitting with a barb or nipple on it and just run new heater hose back to the radiator and then you still have a heater
get a bleed kit or make up some with clear plastic tubing fitted to each bleed nipple
run tubing into a clear dispoable container for each with enough fluid in them so as not to allow air back up the tubing! 2inches deap should do it so long as the tube cant move out of the fluid!
then you can open all four nipples & slowly pump the pedal & dont lat the master cylinder get too low on fluid! [dont pump hard or fast as it creates bubbles]
when no air is left in the system [no bubbles in jars or tubing then close all nipplse!
allow a couple of minutes for the rubbers to settle to original shape then you should have pressure at the paedal!
I had the same problem with my sable. You need a heater blend door. The one on your car is stuck and wore out. The replacement part costs about fifty-two dollars, labor will be more like about one hundred dollars if you take it to a dealership.good Luck