xj overheating - JeepForum.com
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post #1 of 3 Old 01-24-2011, 02:49 PM Thread Starter
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1990 YJ Wrangler 
Join Date: Jun 2008
Location: pa
Posts: 356
xj overheating

alright so here's what I did. my 96 xjs heater sucked. I flushed the core did away with the control valve and ran a bit of water through the pump thru the whole system to make sure it circulated. come to find out the problem was the vent on the blower. I zip tied it open and the heater worked great. the next day I started it waited for it to warm up and it didn't. it overheated. I changed both the water pump and the thermostat and ran the return line of the pump into the suction still overheats. it has plenty of coolant just kinda stuck. maybe the water froze somewhere? its been really cold where im at. any ideas? im gonna get at it wednesday im out of town now just need an idea here. help!

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post #2 of 3 Old 01-24-2011, 02:55 PM
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1996 XJ Cherokee 
Join Date: Jan 2011
Location: Plattsburgh
Posts: 112
There has got to be a blockage someplace, Did you burp the system after doing all this work, air in the system would produce these symptoms.
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post #3 of 3 Old 01-24-2011, 04:53 PM
It's the crank sensor!
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1999 XJ Cherokee 
Join Date: Nov 2007
Location: Central Minnesota
Posts: 8,850
Did you have a verified concentration of coolant to water?

Replace radiator cap if hasn't been done recently. A $5.00 investment that is often overlooked.

Radiator is in play here. Either frozen or faulty.

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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