Q: Heater core

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I don't believe it is a blown heater core as there are no leaks in or outside the truck.

My car has 176255 miles.
My car has an automatic transmission.

Hello, It sounds like you may be correct in that you have a leaking heater core causing the windows to fog up as a result of the excess moisture inside the cab. I would recommend having a professional from YoruMechanic come to your location to diagnose and inspect your heater.

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