I have a 2012 Silverado 1500. The defrost blows hot air, but the windows don't defrost and they fog up even worse. The truck is also leaking what it looks to be coolant out the bottom of truck.
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There is a leak in one of the hoses or even the radiator in your truck. This can cause this issue you are having. You need to locate this leak and have it repaired in order to correct this issue.
If you generally do any type of work/repairs to your truck you can probably locate the bad hose and replace it.
Otherwise, you will have to have it checked out at your dealership or local garage.
It's possible the hose has just came loose and may just need reclamping and may not have to be replaced.
Check all hoses for leaks, and radiator
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