06-05-13, 02:56 PM
I have a 1999 SLS that keeps over heating. I just flushed the coolant and put new coolant in but the problem still exists. When driving and the car starts to heat up I will crank the heat on, sometimes when it gets hotter the heat blows out cool air. I am trying to pin point the problem but I am not car savy at all so I am doing my best and appreciate any help I can get. When I pull over after the car starts getting hot the coolant bubbles out the coolant cap after I open it a little to release the pressure. Are there any easy steps to pin point the problem so I don't go to a mechanic & have him fix 10 things that isn't the actual problem? I really love my SLS but its now summer & I can't drive my car at all. I've been told it could be a spring in the thermostat and possibly a water pump. Also is it a must to use the GM orange dex cool. Thank you everyone for any help or suggestions given.