Might be a leaky heater core, the anti freeze in the coolant has a sweet smell/taste.
One code is BUBBLE
Overheating is due to, well, the coolant in the cooling system getting too hot. In a normally operating engine, this should never be a problem. First, check that the coolant level is correct. If it is correct, I would suspect a problem with the thermostat. When the engine is cold, the thermostat closes off coolant flow through the engine until the coolant reaches a pre-determined temperature. When that temperature is reached, the thermostat opens to allow the coolant to circulate at that exact temperature. Thermostats are known for failing and either not opening or not opening enough at that pre-determined temperature. This causes coolant to get trapped too long in the engine coolant chambers, heating it beyond limits, causing the engine temperature to increase and possibly overheat. If my Maxima was overheating, I would check the coolant levels and then possibly replace the thermostat. It usually is no more complicated than that.
The Bubble Model.
The heating element probably burned out causing the open circuit. The element needs to be submerged in coolant completely, all the time that it is plugged in.
A bad head gasket or a cracked head(s).
The same thing that causes soda to bubble when it is poured on almost anything.
There is no coolant cap. You add through the expansion chamber (opaque bubble to the left of motor.)
Low coolant level.
when u have low coolant
The coolant level may be just a little low and you're getting air bubbles through the coolant that circulates into the heater core. It doesn't cause any problem and can make that noise even if there IS enough coolant. Sometimes, even when the coolant level is up, an air bubble can get caught in an engine and when it makes noise it can cause concern, but it won't damage anything.
Might be a head gasket issue or cracked head but if so it will usually bubble back into the coolant overflow when you shut it off, or coolant in the oil when you do an oil change. If it is an electric fan setup it may only be working some of the time.
Normal causes are low coolant and an inoperative radiator fan.Normal causes are low coolant and an inoperative radiator fan.
yes, it would
There is air in the system, probably from a head gasket leak
Low coolant
Low coolant? Bad sensor?