Iv got no hot air out the heater i put a new thermostat flushed the rad lots of silt & rust came out i was hoping that would of fixed it but no.the top hose is hot but the lower hose to the stat is cold i put new coolent in bleed from the bleed screw on top of the thermostat housing & even from the inlet hose on the matrix that hose doesnt get that hot aswell if the heater matrix was broke would u get no air at all not even cold?i was told the head gasget would this affect the the the hot air going in to the car?