![]() ![]() Because your coolant is actually kind of a slimy, greasy liquid, this produces an obscuring film over the windshield. While it's supposed to be blowing warm air up on your windshield to remove the fog, what it's doing is spraying a fine mist of coolant across the glass instead. This isn't actually fog that you're seeing, it's coolant that has been aerosolized by the air flowing through the blend door. Typically, you'll turn your heater on to defog windows but when you have a certain kind of malfunction in your heater core what you'll notice is that they actually begin to fog up. Again, remember that this is a very toxic substance so you want to get it cleaned up as soon as you can and get the leak fixed as well.Īrguably the most bothersome and dangerous side effect of a problem in your heater core is the window fog or film that can develop as a result of a malfunction. Most coolant is either green or orange in colour, so this is what you'll notice. It may also leak out through the vents themselves. They'll typically run down by your feet, or perhaps by the feet of the passenger depending on exactly where the heater core is located in your vehicle. Since the heater core is located behind the dashboard of your vehicle typically when the leak is occurring in that area you will notice the coolant leaking down the inner walls of your vehicle around the centre console. In addition to the smell, you may also notice a coolant leak in the cabin of your vehicle when the problem is in the heater core itself. As we said it's a particularly sweet odour, so if you're smelling that when you turn the heater on in your vehicle it's almost guaranteed that somewhere in your coolant line you've developed a leak. If animals or people drink it, it can't be fatal even in very small amounts.īecause the smell of antifreeze is so distinct if there is a leak in the coolant line through your heater core, you're going to notice the smell in the cabin of your vehicle. This is a big problem with antifreeze and it's a reason that you need to keep it stored safely and disposed of safely as well. ![]() In fact, if you let antifreeze sit out unprotected it will very likely attract animals to try to drink it. Antifreeze has a very distinct odour that smells sweet. It's been the go-to coolant in most vehicles for many years now. That's the main constituent of antifreeze. The coolant in your vehicle is typically made from something called ethylene glycol. Several parts of the core could have failed for this result to happen including a leak in the coolant system, to a problem with the blend door, to the need for a heater core flush so it may take some diagnostic work to get to the heart of the matter. If you turn on the heat and either no air is blowing at all or the air is just the same temperature as the air outside, even if the engine has been running for an extended period of time, that it's a good sign that something has gone wrong with your heater core. This one may seem too obvious to even mention, but of course this is the likeliest sign you'll have that there's a problem with your heater core. There are a number of ways that this system can go wrong on you so if you're experiencing any of these signs you should take your vehicle into a mechanic to get it looked at so you can figure out the exact nature of the problem and see what you can do about it. There are fins inside of the core that hold heat that absorbs from the tubes that travel through it carrying that hot coolant from your engine. The heater core is basically just a small radiator. The blend door will often play an important role in figuring out how exactly your heater core is failed if in fact it has. That allows air pulled in from outside to mix with the generated heat and blow out into the cabin. Inside the heater core is what's called a blend door. The coolant in your vehicle if you can get up to over 200 degrees Fahrenheit, so there is a lot of heat to be spread around here. So on a cold day if you try to heat up your car, the heater core diverts the coolan t on its way back from the engine through the core and a fan then blows the warm air into the cabin of your vehicle so that you could warm up. The heater core is essentially a detour in the coolant line from the engine back to the radiator. ![]()
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