AC, not blowing hot air, only cold air

thermostat probably sticking.. is the temp running normal or cooler than normal

replace the panel control or heat control valve

your thermostat is stuck open your coolant is probably very rusty as well.

the jeep cherokee are fitted with a heater valve that sometimes get blocked or stuck in the same place .Start by checking weather the heater pipes going in to the heater matrix are hot if both pipes are cold then your looking at a thermostat problem and if only one of the pipes are hot then its more than likely to be the valve

sounds like the clutch field on or bearing on the front of the compressor went bad take a closer look at the pulley on the comp. and see if there is any debris or melted plastic coming out behind the pulley,if so the clutch,field and bearing should be replaced,hope this helps

orfice tube stoped up or make shure motor electric fan comes on when u cut ur ac on with motor runing

try recharging the ac

Generally this condition is the result of coolant loss, or failed thermostat. If coolant goes below cylinder head level, or thermostat remains closed,heat will stop working. Do not drive with this condition as excessive heat buildup in cylinder head can and will do serious damage to heads and or head gasket.
Find out where leak is and correct it. Change thermostat as it may also be damaged. Check for excessive steam from tailpipe or miss in engine, as these symptoms indicate a cylinder head problem.

the blend doors have broken...you will need to remove the heater/ac box to replace them

Try recharging the AC unit.