heating problems

if its blowing cool air it may be low on antifreeze, if its not blowing at all may have faulty blower motor or electrical problem

if the heater hoses are connected to the heater core and blower motor works. Then you have a common problem with jeeps the vacuum tubing connecting the heater box door diaphram is broken or torn just replace the tubing. The heater box is under the dash behind the glovebox. No vacuum and the diaphram operating the door won't open and you get no heat.