When the antifreeze in a car cooling system begins to overheat and burn, the horrible smell is quite unmistakable. And then of course, there's the dry ice effect floating out of your hood that leaves you in no doubt. Well, people hate things going wrong with the car cooling system because they can be potentially expensive to fix. Diagnosing them and tracking down the source of the problem though isn't as hard.
They don't call it a car engine cooling “system” for no reason. It's a complex multiple component appliance that can fail at different points. To begin with, there is the radiator on the front of your car, the pump that pumps coolant or water through the system, there's the radiator fan, there is the thermostat and there is all the plumbing.
When your car starts up, the coolant pump, turned by a belt from the engine, begins to draw up all the coolant collected at the bottom of the radiator sump, and it comes it straight into the engine. The coolant goes through all the tunnels and jackets and piping, becomes very, very hot collecting heat from the engine, goes past the thermostat to tell the thermostat how hot it is, and then it goes on to the radiator. The radiator core is made up of lots of little pipes connected to all the fins. The fan blows cool fresh air through the fins to cool the radiator down, and the coolant cools down as well. And so the cycle continues.