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Old 11-12-2011, 04:43 PM   #1
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2003 TJ overheating

Been having a problem and can't figure it out. Need some advise. My jeep's temp usually stays at 200-210 range. After a while at that temp it will shoot up to 255-260 range and bounce back and forth from 210-255. It has done this idling and maintaining 60 mph both. I replaced the thermostat 1st. I did a radiator flush. It continued to do the same thing. I replaced the thermostat sensor next. Thought that solved it but still doing same thing. I thought the sensor for the temp gauge might be out. Before I had a chance to replace it my radiator busted on top. I have now replaced it. I don't think my root cause has been fixed and I am scared to drive it. Any suggestions.

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Old 11-12-2011, 07:02 PM   #2
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By process of elimination, only things left are the water pump and the gauge. How many miles on your water pump?

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Old 11-12-2011, 08:20 PM   #3
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Are you burping the cooling system of all air afterward? Bubbles can move around and when they get next to the sensor in the thermostat housing, they can cause the gauge to give crazy indications. Did the thermostat have a little burp hole in it (or did you drill one) and positioned at the top when you installed it to facilitate the system purge its own air out through the radiator?
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Old 11-13-2011, 07:43 AM   #4
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Water pump is original and has 111119 miles on it.
I did place the purp hole on top. I plan on running it today and with the cap off and add antifreeze to it to see if that might get rid off air pockets.
When I ran it last night the heater was blowing cold air. This was not happening before so I assume the heater core isn't getting any circulation.
Thanks for responses. I will change the sensor to gauge next and see what happens. Last I will change the water pump.
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