My 99 XJ has had a heater issue the last 2yrs, to the point of defrost was luke warm.
Last year I did a quick flush on the heater core to no avail.
This time I bought a heater hose adapter for a garden hose and some prestone cleaner.
Disconnected hoses last night, blew em out and poured some cleaner in.
Let it sit overnight. This morning I flushed and reverse flushed about 20x. Each time I would get a quick faint second of dirty water.
Finally both ways were clean.
Also replaced the upper heater hose and spliced it, so I could reverse the hoses.
Took it for a drive and YES!!!!
I got my heat back. Roasting now.
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