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Re: how do i fix heater core on a 2006 chrysler 300
If you're getting hot air, it's not the heater core.
Windows fog up because the humidity level inside the vehicle increases while the temperature of the windows decreases to a point where the dew point of the air is higher than the temperature of the glass. When this happens, moisture from the air condenses onto the glass. When you breath out, you increase the humidity of the air in the car because of the moisture in your breath.
The key for defrost to work isn't necessarily heat, it's more important to dry the air. There are two ways of doing this:
1.) Make sure you have the air recirculation turned off. This feature causes your car to recirculate air from inside the car through the air ducts. In the summer when it's hot and humid outside, this is what you want. However in the winter when the air is dry, you want to bringing fresh dry air from outside to replace the humid air inside the car.
2.) Turn on the A/C compressor. This will cool the air before it passes through the heater core. Cooling air removes moisture. This is why your car drips water from underneath in the summertime when you run the A/C. It is literally removing moisture from the air.
However, if your heater isn't working (blowing cold air even when on the warmest setting), then you may have a different problem.
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There is a drain for the heater plenum, it could be plugged up. Keeping water in the plenum. The drain is a rubber hose on the fire wall, on the passenger side. It just angles down. This will cause the fogged windows. You'll have to get it inside for awhile to thaw out, then blow air up in it to clear it. The other thing it could be is a leaking heater core.
This may be due to a bad heater core or dirty core with a plugged water drain, first see if the a/c works. turn it on and see if the air gets cold and if the ac compressor works.
The way the defrost works to keep windows from fogging up is that when the front defroster is tuned on the ac should also be on, on most cars when you go to defrost it will turn ac on automatic. the system then uses hot and cold air to remove the moisture in the air to avoid window fogging. if your a/c is not working then that may cause window to fog, but if you are also getting a smell then the drain that lets out condensation may be plugged and then water builds up and also mold from always being wet and when heat is on you smell that.
i want you to run the defrost and when windows fog up wipe window with hand and see if it is greasy . if it feels oily then you may have a bad heater core, the core leaks coolant out and steam and causing windows to fog up with a flim of grease.
If your car has an air conditioner turn it on as well as the heater . Air conditioned air is very dry and usually defrosts the windscreen quickly. The heat from the heater will overcome the cold air from the air/con. It is good for the air/con to be run during the winter months as well as summer, it stops the seals drying out and leaking refrigerent.
Make sure the vent system is set to draw air from outside. If it is set to recirculate the same air that's inside the vehicle without drawing fresh air from outside, the resulting humidity that builds up inside the vehicle can fog the windows even when you run the defrost. You can also try opening the windows a bit to get some more air moving inside.
If it still fogs when the vents are set properly, you may have a leaky heater core. The heater core is a small radiator that is located under the dash that the heater system blows air through to heat the inside of your car and provide heat to defrost the windshield. The fog may be coming from the heater core leaking hot coolant steam that's being circulated through the defrost system. If this is so, you will need to replace the heater core.
The mildew smell you refer to could be anti-freeze. When a heater core starts leaking it may allow anti-freeze (which circulates through it for heat) to be blown through the ducts onto the windshield in defrost mode. The repair is to have the heater core replaced. It may wait for the thermostat to open and allow the coolant to circulate before you notice it. Occasionally the carpet on the passenger side may be wet from leakage.
your heater core has probably sprung a leak.does the fog smell kinda sweet?....check the floor in the front where the floor mats are for moisture or even puddles of antifreeze.(the replacement of a heater core can be very expensive as the entire dash usually needs to be removed to access the heater core)also look under the engine near the firewall for antifreeze drips.