Heater does not heat, AC and fan work fine - 1995 Jeep Grand Cherokee

Charlie, 1st thing is to check your fuses. I will post some links to help you see and solve problem. May not be your exact model but steps are basically the same.
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CHECK YOUR HEATER RELAY SWITCH AND YOUR FUSES

I have same problem, have to put small heater in truck and plug in for cab and windows to defrost. Once on hiway i'm fine because heat is stuck on no fan though. City driving gets very cold and windows frost. Need wiring diagram.

It may be the heater fan motor or connection to it .
I have replaced a lot of these that required a new connector to make then work....as the original connector semi melted at the fan motor.

Sound likes possibly the blend door motor has gone bad.
Take it to an AC shop and hav e them check that out....its not an expensive part or hard to change if you know what your doing and where to look

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

Hi
Check for bad connection at heater resistor or try tapping heater motor lightly
with ignition switch on and heater switch on. Could be heater switch connection.

is the switch on dash in one piece as on these cars the bottom of the switch breaks ,you push switch to turn on a/c and turn it for the fan left is re circulate right is fan with fresh air in as well

you probably need a new heater core or pump.

Try spinning the knob real fast in either direction. Sounds stupid but it worked for me.

mechanical or vacuum operated valve that releases hot coolant into the heater core may be stuck closed. or the heater core may be clogged. hope this helps.