Check fuses
Check for loose connection in fuse block
I have exactly the same problem on my 2000 Still looking for the answer
if there is a lot of snow or ice on these vents located at the bottom of the wind shield under the wipers that could be the problem if you live in a cold environment.
Check the coolant temp sensor, or just replace it if you have the money to burn.
Check that the wire on the rear defroster is connected to the defroster. If broken off repair it.
The defroster is a thin filament that is run across the rear window sometimes inside that heats up to remove frost. first off does the switch light up when pressed? is there power to the connector at the back window? if so then check the filament itself for breaks this may be the problem, if not then it may be a blown fuse, or bad connection.
"What" on the suction line of an air conditioner indicates a problem?
One reasons a Dodge W 250 defroster may not work is the blower motor relay. This can be replaced easily. If it isn't the relay, there may be a problem in defroster door binding. A mechanic will be able to determine the cause.
Had the same problem. Make sure the rear window is all the way up. This is probably a safety feature? Your wipers and rear defroster should work.
No you cannot sue unless it was sold with a warrenty.
you have a sensor problem.
line conditioner
Could be a vacuum problem--either broken or disconnected hose or bad vacuum motor under dash or coming in through firewall Defrost is the default position for this system