5.2 overheating - JeepForum.com
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post #1 of 7 Old 08-29-2019, 01:35 PM Thread Starter
Z-Jake
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5.2 overheating

Hello,

This whole Jeep and 4x4 world is new to me, so please excuse my ignorance.

I purchased my ZJ in June, and have been having a total blast with is at the local 4x4 spots. One day I was out wheeling and had just gone up a decent incline in 4lo, when at the top I started to smell coolant. I jumped out and the lower radiator hose had come off at the radiator. I tried to get it on as best I could, but it was really hot (duh). I limped her home as quickly/carefully as I could, she reached about 250 when I parked her. The following weekend I filled here up with coolant, took a quick lap around the block when temp shot up to 260 and the dash light came on. Parked her and popped the hood, the coolant overflow was boiling and engine was steaming.

I ran her at idle yesterday for a while and temp didn't go past 210, had the rad cap off and didn't see bubbles when I revved her at the TB. I closed her up and went around the block temp was steadily climbing, but didn't get past 220 before I parked her, waited til rad cap was cool, when I opened it about a gallon of coolant came spewing out. Does that mean compression is ok?

I've been reading not stop the last few weeks and have begun to think its either a head gasket or cracked head, but as I stated I am totally new to this and don't know what Im doing..

Hoping you guys can give your opinions on what it might be and hopefully point me in a direction that gets be back out there soon. Thanks

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post #2 of 7 Old 08-29-2019, 02:16 PM
wingless
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Welcome to the forum.

Please ID your engine and year.


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post #3 of 7 Old 08-29-2019, 02:25 PM Thread Starter
Z-Jake
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Sorry bout that, pretty important info.

98 5.2
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post #4 of 7 Old 08-29-2019, 03:28 PM
jtec
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5.2 is conventional viscous fan drive, First thought is thermostat - remove to test but advise a new T'stat, use correct rating, see if you can borrow rent a coolant system pressure tester. This would recognize a head gasket issue quickly as pressure rise is seen faster than temp.

Ck for coolant in oil and evidence of oil in coolant.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #5 of 7 Old 08-29-2019, 03:42 PM Thread Starter
Z-Jake
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Thanks jtec.

Ill order one tomorrow and see how that works. When you say correct rating I'm guessing you mean the 198 degree T'stat? Also guessing that the tester you mentioned might be available at local car part store?
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post #6 of 7 Old 08-30-2019, 05:49 AM
Zilliver
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You need 195
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post #7 of 7 Old 08-30-2019, 08:20 AM
jtec
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being in the trade I am spoiled - the pressure tester is a great tool to have BUT for a DIYer might be to much to invest - ask the store you are getting T'stat from if they have it as a loaner or rental,...

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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