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Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
Have not had time to check anything out, just happened last night. Previously I had replaced the Thermostat and the Radiator. This was due to a overheating problem without the AC working. It looked like there was MUD in the cooling system so I did a flush and replaced the items as mentioned.
Year: 1998 Classic (I'll get it running soon....) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0
Four possibilities I see right off the top of my head:
Your gauge is wrong. That needs to be verified with a IR temp gun. 260 would probably kill your engine.
The new thermostat stuck closed. Cheap thermostats are really a bad move. Get the best you can find. The best ones (Mopar) are about 10 bucks more than the cheap ones. A cheap one can destroy an engine. Risking that for a ten spot is not very good math.
The mud you flushed out wasn't the last of it. You had globs hiding in your heater core or engine block that got loose and plugged parts of your radiator.
When you flushed out your cooling system you hastened the demise of an already bad water pump. The fins can basically corrode away into nothing, and the don't do a very good job of moving water.
I'm betting on #4, myself.
Last edited by BlueRidgeMark; 07-14-2018 at 07:48 PM.
Four possibilities I see right off the top of my head:
Your gauge is wrong. That needs to be verified with a IR temp gun. 260 would probably kill your engine.
The new thermostat stuck closed. Cheap thermostats are really a bad move. Get the best you can find. The best ones (Mopar) are about 10 bucks more than the cheap ones. A cheap one can destroy an engine. Risking that for a ten spot is not very good math.
The mud you flushed out wasn't the last of it. You had globs hiding in your heater core or engine block that got loose and plugged parts of your radiator.
When you flushed out your cooling system you hastened the demise of an already bad water pump. The fins can basically corrode away into nothing, and the don't do a very good job of moving water.
I'm betting on #4, myself.
Thanks for the feedback. The cooling system works fine without AC running. Normal operating temperature is 190. Only overheats when AC is running
Can you recommend a specific water pump for replacement. I noticed the SUMMIT has a High Flow pump that has a machined impeller. The ones on Rock Auto website are stamped and formed.
Four possibilities I see right off the top of my head:
Your gauge is wrong. That needs to be verified with a IR temp gun. 260 would probably kill your engine.
The new thermostat stuck closed. Cheap thermostats are really a bad move. Get the best you can find. The best ones (Mopar) are about 10 bucks more than the cheap ones. A cheap one can destroy an engine. Risking that for a ten spot is not very good math.
The mud you flushed out wasn't the last of it. You had globs hiding in your heater core or engine block that got loose and plugged parts of your radiator.
When you flushed out your cooling system you hastened the demise of an already bad water pump. The fins can basically corrode away into nothing, and the don't do a very good job of moving water.
I'm betting on #4, myself.
Ill add two more, just because.
5. A failing a/c compressor. The extra load can slow the engine speed down just enough to cause problems once the a/c clutch engages.
6. Blocked radiator fins. The a/c condensor warms up while the ac is running. If the radiator fins are blocked, the heat from the a/c condensor just makes it worse.
Im not saying one of them is the issue here. Theyre just something i picked up along the way.
07-14-2018, 12:05 PM
XJ overheating
