99 Jeep Grand Cherokee Ltd thermostat

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02-24-2018, 01:21 PM

Craig Underwood

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Model: Cherokee(SJ)

99 Jeep Grand Cherokee Ltd thermostat

The upper radiator hose blew. I replaced and refilled coolant, still ran hot. Then I replaced the thermostat. It is still running hot. Could it be the water pump, or am I overlooking something easier to fix?

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02-24-2018, 01:39 PM

firebane

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Year: 1998

Model: Grand Cherokee (ZJ)

Engine: 5.2

What do you consider "running hot"?

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02-24-2018, 03:07 PM

PatHenry

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Year: 1995

Model: Cherokee(XJ)

Engine: I6 4.0L

It -could- be the water pump if you're overheating. I once had a pump break the impeller off while the bearing and seal were fine. It overheated quickly though.

I would guess that you probably haven't burped all the air out of the system or you're overdue for a flush.