sup people a while back my car thermostat had messed up an the radiator coolant was coming back through the resivouir (back up coolant) since then i flushed the radiator an put in a 160^ thermostat ,but car doesnt run like it use too , i already took the car to autozone to get scan an no codes came out , a local mechanic told me its the heads gasket gone out due to the overheated of the heads, so he just told me that the head gaskets need to be replaced thats it !! any suggestions would help
3.8 pontiac grand prix GT 1999 107,450 miles on car
