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2019 1500 Interior Windshield fogging and icing

Jerry Walleston
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Jerry Walleston Enthusiast

Jerry Walleston

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1 hour ago, Thomcat said:

Thought original post mentioned just the windshield was affected? Moisture trapped inside the vehicle will deposit on all internal glass surfaces, afterblow or heater core leakage only shows up on the windshield. Good Luck with removing your water bottles.

Yes, just the windshield.

Thomcat Senior Enthusiast

Thomcat

Posted
Posted
1 hour ago, Jerry Walleston said:

Yes, just the windshield.

Well mine too!

 

My HVAC is always on auto and A/C engages as it warms. I know for certain mine is condensate aggravated by an active afterblow setting. 

 

If your moisture is ice below freezing and not greasy or reddish when wet, then it is water not coolant. Suggest you do a quick and easy test - block the defroster vents during an overnight park with sheets of paper and see if the situation changes. If moisture disappears from the windshield and/or paper is moist or icy it is only condensate from the heater core.....if you find the papers blown off the dash/defroster vents then the afterblow setting is also active.

 

Either way, better off having the moisture on the windshield than promoting bacterial growth on the heater core where it will eventually stink up the HVAC system.

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