Having problems with your 2006 Chrysler 300 ?

How do i fix heater core on a 2006 chrysler 300

\015 My defrost works horribly my windows always fog up. someone mentioned it might be the heater core. any suggestions if thats what it could be and how do i fix this?\015 Posted / edited by AnonymousUser on : 19-08-2019

Answers :

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.
I had the same problem it was the heater core o ring bad. I pulled the heater core ( with out tearing into the dash) then replaced both clamps and o rings and the problem went away.
Repair Help & Product Troubleshooting for 2006 Chrysler 300

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