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The warm coolant leaking into the cabin of the vehicle caused fog because that coolant was previously sitting inside a warm and temperature-regulated coolant system, and now it's evaporating into steam as it hits the cooler air inside your car.

With that warning out of the way, I'm only going to give you a very basic guide for most cars and trucks from 1958 to 2010. If anything got broken on the way out, please make sure to replace it on the way in.

CAUTION:

As with most DIY tasks, you take on this one along with all the risks involved. Remove the heater core housing and set it on a table. Remove any gauges (be careful if you have a speedometer cable back there!).

6. Though let me forewarn you that it is a very tedious task, and once you know how to do it, all your friends and family will want you to change theirs too!

Whether or not the car got all foggy when the heater core broke, an unmistakable sign of a leaking heater is a fruity, sickly-sweet smell inside the car. If your heater stops putting out heat, and your engine seems warm, investigate whether there is a coolant leak elsewhere, or some other issue with your car.. Replacing a heater core--maybe not so easy.

Your heater core is usually behind your dashboard, under the center or the passenger side. This is the smell of your radiator fluid and definitely a sign that coolant is leaking into your car.

http://giganticband5742.shutterfly.com and easy answers so you can get your car fixed ASAP.

Where Is the Heater Core Located?

I'll give you five clues below that will help you decide. Sadly, if the leak is hard to find, the reason may be that the coolant has been leaking into your cabin when the system is cold, and instead of making fog it's creating a puddle. It may indicate that your blower motor or another component of your heater has gone bad (cheer up, it may be a component that's less tedious to fix than the heater core). Disconnect the battery.

2. They can be epic battles, depending on what kind of vehicle we're talking about. It will have some sort of casing or housing and is usually buried behind almost every other component of the dashboard.

Overheating is very serious for your car