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Unread 11-09-2013, 09:22 AM   #1
Registered User
2002 WJ 
Join Date: Apr 2009
Location: Cerntreville, VA
Posts: 17
Overheating WJ limited 4.7

Hey guys,

Trying to troubleshoot overheating WJ. Problem first noticed on highway drive cabin heat suddenly stopped and engine started to over heat.

Made it home without hitting red mark, and now trying to narrow down the cause.

In garage I can turn on from cold, allow to come up to operating temp, then will immediately start creeping up higher. Reservoir is full of coolent.

After turning engine off when overheating is beginning, for 10-15 minutes afterwards, I can hear what sounds like a tiny leak of pressure escaping. I can affect the sound of the leak by squeezing upper radiator hose. Upper radiator hose does get hot when engine is at and above operating temp so appears the tstat is opening as it should. Do not see any sign of coolent leaking.

Waiting for engine to cool down to make sure coolent is full via radiator cap and bleeder valve.

Figure I will start with the obvious of making sure coolent system is full. Beyond that, water pump?? If pump was problem would upper radiator hose get hot?

And why no cabin heat?


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Unread 11-09-2013, 11:07 AM   #2
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2002 WJ 
Join Date: Apr 2009
Location: Cerntreville, VA
Posts: 17
Took about 3/4 gallon coolent and them burped a bunch and then another top off. Runs cool with cabin heat back to normal. Love the easy ones!!
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Unread 11-09-2013, 12:41 PM   #3
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2004 WJ 
Join Date: May 2008
Location: MN
Posts: 211
Glad it was an easy fix!
99' Jeep Wrangler White on White Sport 4.0 Auto
04' WJ Overland Graphite 4.7 H.O. Quadradrive
01' WJ Laredo 4.0 Loaded Quadratrac II
96' ZJ Limited 5.9 mods 242 T-case
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Unread 11-10-2013, 07:43 AM   #4
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2000 WJ 
Join Date: Mar 2013
Location: Toadlena,, Northwest New Mexico
Posts: 314
Are you sure it's that easy? 3/4 of gallon of coolant had to go somewhere....
2000 wj limited quadradrive 4.7 family vehicle-was stock, then lifted 4",now stock again
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