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Overheating. Have the cooling system checked.
bad heater core.
The heater core has a air pocket somewhere in the lines.
Your coolant is low.
Low coolant and air in the heater core.
The HeaterTreater is an after market kit that solves heater and AC for the Jeep Grand Cherokee and Laredo. It is much cheaper than the dealership fix and is easy to install. For diagnosis and info, check out www.heatertreater.net or search eBay for "heatertreater".
No, the XJ Cherokee does not have the same heater box as a WJ Grand Cherokee.
Your heater core is going bad, or there is air in the system. Happened to me had to replace heater core. I did it myself and it was a little bit of a pain. Took four hours.
There are several things that can cause heater problems in your 1998 Jeep Grain Cherokee. The most common cause of heater problems is low fluid in your cooling system.
Do you live in an area that you need your heater?
heater vent will not readjust to any position
check the fuse or the ground on the heater