think about it they have independent control thus they have separate cooling systems
You may have a short in the ignition system.
Detonation
Leave it turned off.... doh
you may not have the heater water hoses plugged in
There are two separate accumulators one for front and one for rear
Because the interior lights 10 amp fuse was blown.
wah wah wah
It is either your water pump or your thermostat
The front expansion valve is clogged.
bob is the best
Restriction in the catalytic converter.
Most of the dodge pickups around that year had vaccum engagement on the front end. The diaphrams would blow out or the supply line to them would get holes in them. with the engine running and the shifter in four wheel drive pull the line off the diaphragm and see if the is vaccum there.