Heater not working

Jeep Grand Cherokee is notorious for broken blend-air doors. This is the door inside the A/C-heater housing that switches the air from hot to cold. You must remove the dash to repair it.

Maybe bad blend door

Either your heater core is plugged up or your line to the core is restricted. Do a complete reverse rad flush with a radiator cleaning solution and try it. If that doesn't work you'll need a new heater core.

Replace the blower motor relay, it is defective and sticking internally, causing the heater motor to keep running.

possibly some other part affecting the blend door if you feel ac air or no heat

never heard of this before ,i have worked on quite a few jeeps here in spain but never had this before .power steering yes ,radiators yes ,funny american electrics big time ,does yours have the manual fan and a back up electric fan or is it all electric fans .Quick tip ----if it starts to run hot ,put the heater on screen and blower on full this will keep the engine cool ,if no heats comes out of heater then stop because you have no water in the rad

hello, this sounds like a bad blower motor resistor!! its cheap and easy to change..if you need more info on locations let me know,, good luck.....marty

Could be the switch or the resistor.

check blower motor.. give it a tap when you start the vehicle and turn on the heat.. if it come on then you would have to replace the blower motor..if it does not check for fuse..

Change your Thermostat.