Dodge Repair Questions? Ask a Mechanic for Answers ASAP
HERE is a link with information to get it apart so you can take a look at the heater box It's possible that the leak is in the control module, but this should get you under there so you can have a look.
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You're very welcome and I can assist from here if you need me to, don't be afraid to ask about some of the parts. Also, this article is about removing the heater box. So, everything isn't required to get where you need to be to check stuffs. For example, where it's talking about evacuating the freon for the air conditioning. This isn't something that you need to do because you aren't removing the box, just trying to get to it to check on the vacuum line and the door itself.
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Sorry, I was unable to respond to you earlier.
You have to pretty much remove the entire dash to get the dash pad off to view this.
HERE is another link for that.
If the blend door has come loose from the heater box, then the whole box will have to come out. It's much more common for the control head or the diaphragm to spring a leak and cause the issue you are having.