Low coolant level?
No.
All fuses on a 2005 Ram are under the hood.
No
No.
Yes
If you have the dash removed, you should have plenty of room to remove and install the ac/heater box.
1500-1500, yes
No
Yes
nono
You will need to get a repair manual for this because you will be pulling the dash and the complete a/c-heating box out, very complicated......................
No it will not.