1998 Jeep Grand Cherokee heater stop working?

Answer 1

Same happened for me. Had the coolant system flushed several times and also replaced all hoses.

First time I took it to dealership and they unclogged the heater core. Gave me heat for a month or so.

I bought the vehicle used and didn't pay attention to the coolant system. Appears that it was neglected over the years from previous owner so there's lots of rust and debris in system. No real easy way to clean the system other than to flush multiple times. Taking engine apart and replacing radiator is not an option for me.

My advice - flush the system (or have your mechanic do this) very good.

I had everything checked including the heater core which turned out to be fine. Flushing system many times to clean it out was the key for me.