please help my town doesnt have a computer and neither do i
It's probably burning off dirt and dust that has built up over the summer and needs to be cleaned. The vent could be partially blocked, too.
they would have to perform a cooling system pressure test. it could be multiple things that cause an overheating condition in a vehicle. first step is to check to see if there is any leak. if you are adding coolant then its going somewhere.
on some of the gm v6 engines, you will find a cooling system air bleed port, a little screw or bolt that you can loosen to let the air out. honda has also had the same idea. if you dont bleed the air out, the thermostat will not open, so you over heat. this will also effect the efficiency of your heater.
suggest that whatever you do..do not run it with low coolant,as overheating will usually result in big problems. find out where the coolant is going,and go from there. The heater heats and then goes cold could be due to low coolant levels
