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All I am looking for some information on how to fix the problem that I have with my defroster on my 2007 tundra 5.7

The problem is the engine gets up to temp but the defroster does not work just blows cold air. I have tried to switch between cold, hot and AC. But when I put it in gear and start to drive it starts to work and will work properly until I park the next day. All of the issues that I have searched have revealed that the problems are no air or does not work at all. I am just looking for some guidance on this so I can trouble shoot. Thanks
 

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Are you sure the blend doors are actually moving? Have you checked how much fluid you have in the system? If you switch from defrost mode to floor mode does the heat come on immediately?
 
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