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Joined: Sep 2014
Posts: 21,981 Likes: 11
Campfire Ranger
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Campfire Ranger
Joined: Sep 2014
Posts: 21,981 Likes: 11 |
"Pulled radiator and replaced", replaced old one or installed new, not clear to me? Is the a/c condenser full of debris, blocking airflow? How hard to pull thermostat? Try running without theromstat. Just because something is new, don't mean it works.
Parents who say they have good kids..Usually don't!
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Joined: Jan 2009
Posts: 5,753
Campfire Tracker
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OP
Campfire Tracker
Joined: Jan 2009
Posts: 5,753 |
It's a new aftermarket OEM spec radiator, as mentioned I wish I would have just spent the extra 100.00 on a double row radiator vs the single stack.
Condenser is in pretty good shape with no debris as I cleaned that out the first time I had the radiator out. Heat & A/C are working normal.
I've replaced the thermostat twice, the thermostat isn't terrible to pull other than the lower radiator hose is a bit*ch to get back on.
Life is just one damned thing after another
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Joined: Jan 2009
Posts: 5,753
Campfire Tracker
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OP
Campfire Tracker
Joined: Jan 2009
Posts: 5,753 |
Someone on a jeep forum (you guys have been more help) said "it has to be a bad head gasket".
I've replaced a few head gaskets and this one has no symptoms. Pressure test is good, nothing in the oil, nothing out of ordinary coming out of the exhaust. Not gassing out of the radiator and not leaking a drop anywhere, nor is the coolant level changing. Also seems to be running great and each exhaust port is within 10 degree of one another.
Life is just one damned thing after another
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Joined: Oct 2016
Posts: 8,109
Campfire Outfitter
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Campfire Outfitter
Joined: Oct 2016
Posts: 8,109 |
If you can not find a malfunction in the engine, I'd check the reporting sensor and reading gauge. Wouldn't be the first sensor to go bad.
An unemployed Jester, is nobody's Fool.
the only real difference between a good tracker and a bad tracker, is observation. all the same data is present for both. The rest, is understanding what you're seeing.
~Molɔ̀ːn Labé Skýla~
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Joined: Jan 2001
Posts: 21,317
Campfire Ranger
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Campfire Ranger
Joined: Jan 2001
Posts: 21,317 |
I deal a bit with instrumentation. If your temp sensor or gauge is going bad, I would be extremely surprised if that resulted in a false high reading. If it's going bad I'd expect the reading to either be all over the map, or it would read nothing at all.
Take it out for a drive, once it starts reading high pull over, pop the hood and take ir temp readings to find the source.
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Joined: Jan 2009
Posts: 5,753
Campfire Tracker
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OP
Campfire Tracker
Joined: Jan 2009
Posts: 5,753 |
I deal a bit with instrumentation. If your temp sensor or gauge is going bad, I would be extremely surprised if that resulted in a false high reading. If it's going bad I'd expect the reading to either be all over the map, or it would read nothing at all.
Take it out for a drive, once it starts reading high pull over, pop the hood and take ir temp readings to find the source. I believe the same thing in regards to the instrumentation and in regards to the 2nd part - I did, hence where the readings came from that I posted above.
Life is just one damned thing after another
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Joined: Mar 2013
Posts: 860
Campfire Regular
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Campfire Regular
Joined: Mar 2013
Posts: 860 |
Someone on a jeep forum (you guys have been more help) said "it has to be a bad head gasket".
I've replaced a few head gaskets and this one has no symptoms. Pressure test is good, nothing in the oil, nothing out of ordinary coming out of the exhaust. Not gassing out of the radiator and not leaking a drop anywhere, nor is the coolant level changing. Also seems to be running great and each exhaust port is within 10 degree of one another. It's not an uncommon problem on the 4.7 v8s. Like I said my parents was doing exactly what you described for a couple of years before it finally got worse. The mechanic I mentioned earlier has spent his life working on Jeeps and has owned a couple of 4.7 v8 WJ's. If it's a cracked head gasket, depending on the severity of the crack I could see it exhibiting exactly what you're describing.
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Joined: Jan 2008
Posts: 4,219
Campfire Tracker
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Campfire Tracker
Joined: Jan 2008
Posts: 4,219 |
Might want to do two tests. One is an analysis of your oil and one for exhaust gases in the coolant. https://www.blackstone-labs.com/free-test-kits.php Coolant test kits can be gotten at any major auto parts store.
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Joined: Feb 2016
Posts: 17,841
Campfire Ranger
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Campfire Ranger
Joined: Feb 2016
Posts: 17,841 |
4.7 L are notorious. Heads/gaskets and pistons/bearings.
Wheelers with V8s often put in hood vents to help w air flow.
Last edited by hookeye; 07/23/17.
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Joined: Feb 2016
Posts: 17,841
Campfire Ranger
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Campfire Ranger
Joined: Feb 2016
Posts: 17,841 |
Had an 04 GC w 6 cyl. Hated that thing.
Much prefer the older ZJ version. Both of mine were 5.2L
Last edited by hookeye; 07/23/17.
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