Air bubbles in the overflow tank , no heat. HELP
hello, I have a big/small problem with may Pontiac grand prix 06 supercharger. First it
overheated, change the thermostat , and the hose from engine to the radiator and the
car stooped overheating but now I have no heat,I flush the heat core and again I have
heat but first time I drive it again overheats and a strange sound inside the car like
boiling water. OK now I changed the water pomp, belt, and checked the coolant flow in
the system everything is looking nice, the sound is gone, the engine sounds great and
no overheating but again no heat inside the car , and I noticed today that after I drive a
short time, if I listen near the engine/heater core I hear like a beat, and at the same
time as the sound i can see in the overflow tank a bubble air. (I did bled several times)
HELP HELP HELP, what am i doing wrong!!!!!!!!