I have a dodge ram pickup and the window fogs ups when I turn the defroster on. Are there any other problem that can cause this other than the heater core

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Originally Posted by anklin

i have a dodge ram pickup and the window fogs ups when i turn the defroster on. are there any other problem that can cause this other than the heater core

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Is the vehicle equipped with A/C? If it is, does it work?
The A/C should cycle on periodically during defrost to keep the moisture low inside the vehicle.
If it isn't cycling that, too, could lead to fogging.