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  #1  
Old August 2nd, 2020, 17:49
cherokeefan_1 cherokeefan_1 is offline
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2000xj running hot

2000 xj running hot. I have done a Spectra radiator from Napa, original was leaking. 2 coolant flushes that yielded nothing. Even the block behind water pump has no rust or scale, same with head. I installed a dealer water pump, dealer fan clutch, dealer thermostat, dealer radiator cap. I have tested for exhaust gases in cooling system 3 times. Pressure tested cooling system. Pressure tested radiator cap. Tried an 18 lbs cap and 16 lbs cap. I have now also tried the Napa 4 cylinder xj fan clutch. Also has a new belt. In slow traffic, stop n go, or sitting the temp creeps to 220 then the aux fan kicks on and brings it down to 214. With a/c on it goes up to 224 before I call it quits and turn heat on.

Now, with the 4 cylinder fan clutch the temp won't drop below 210 keeping a high idle, hood open, with heat on. At least with the dealer clutch I could get the temp down to 200 with just heat/high idle.

What I have noticed is the factory electric fan pulls more air through the front of the radiator than either of the clutch fans, at idle.

Oh, and this is a bone stock xj with 230k in super nice shape. Was well taken care of. I will try my factory 91 xj 3 core copper/brass radiator next as it did an ok job of cooling my 91.
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  #2  
Old August 2nd, 2020, 17:50
cherokeefan_1 cherokeefan_1 is offline
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Re: 2000xj running hot

Oh, and this is not a California emissions so only 1 cat
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  #3  
Old August 2nd, 2020, 17:57
cherokeefan_1 cherokeefan_1 is offline
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Re: 2000xj running hot

We've owned this for 3 years but it didn't get driven much as we lived in the city and it's not lifted. Was a replacement for my lifted 91 that was t-boned by a semi that blew a red. But this thing is not worthy of off-road like my 91 was.
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Old August 2nd, 2020, 17:59
RCP Phx RCP Phx is offline
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Re: 2000xj running hot

Have you put a scanner on it, specially with data logging? How about a Mopar temp sensor?
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  #5  
Old August 2nd, 2020, 18:03
Agreen Agreen is offline
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Re: 2000xj running hot

So the original was leaking and it's still overheating or it just started overheating with the new radiator?
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  #6  
Old August 2nd, 2020, 18:05
cherokeefan_1 cherokeefan_1 is offline
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Re: 2000xj running hot

Have not data logged. What am I looking for if I do? I've read the Mopar temp sensor is n/a and I have no clue if the one on it is. O2 seams to react fast but is always pulling fuel, reading a negative 1.6 to positive .8 at idle. Long term trim is negative 6
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  #7  
Old August 2nd, 2020, 18:07
cherokeefan_1 cherokeefan_1 is offline
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Re: 2000xj running hot

The radiator that was leaking is the exact same Spectra I put in from Napa. Not sure about the running hot before as we didn't drive it much, especially when it was 90+
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  #8  
Old August 2nd, 2020, 18:08
cherokeefan_1 cherokeefan_1 is offline
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Re: 2000xj running hot

Maybe next weekend I will swap the radiator out of my wrecked 91. That or the head is cracked but not pushing exhaust into the coolant at detectable levels
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  #9  
Old August 2nd, 2020, 18:09
cherokeefan_1 cherokeefan_1 is offline
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Re: 2000xj running hot

It is the 0331 head
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  #10  
Old August 2nd, 2020, 18:36
Agreen Agreen is offline
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Re: 2000xj running hot

The block test (exhaust gasses in coolant) won't always detect a bad head gasket or crack. I know it sounds weird, but I've ran into that at least 3 times.

1) Grand Am with a 3.3 v6
2) Mazda 3, 2.3
3) old school bus with a 6.9 diesel

Sounds like you've done some decent diagnosis and have a brand new cooling system. It's frustrating, but you probably have to pull the head.
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  #11  
Old August 2nd, 2020, 18:50
RCP Phx RCP Phx is offline
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Re: 2000xj running hot

Quote:
Originally Posted by cherokeefan_1 View Post
Have not data logged. What am I looking for if I do? I've read the Mopar temp sensor is n/a and I have no clue if the one on it is. O2 seams to react fast but is always pulling fuel, reading a negative 1.6 to positive .8 at idle. Long term trim is negative 6
That's the kind of things you need to know, you very well may have intake/exhaust leak. You don't even have hot ambient temps!
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  #12  
Old August 2nd, 2020, 19:25
cherokeefan_1 cherokeefan_1 is offline
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Re: 2000xj running hot

Yeah, I know about exhaust gas in the coolant not always being good. On big trucks they rarely work unless there is a massive issue. Same with equipment. I don't lose coolant or gain oil so I figured the head/gasket was good.

Maybe I will buy a intake gasket and redo it. It has the cast exhaust with dual down pipes 6:2:1 style instead of the tubular stainless 6:1. Never seen that before but not familiar with these late model Cherokees.

I just know it's the head, somehow. I really don't want to support china with an aftermarket and don't see the point of Edelbrock unless I rebuild which is not happening now.

So, need to find a good used tippy.
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  #13  
Old August 2nd, 2020, 19:30
cherokeefan_1 cherokeefan_1 is offline
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Re: 2000xj running hot

The 4.0 in my 91 ran strong, only leaked oil. And I beat on it for 170k. Did the head gasket at about 50k and it had a big score in #4 but had good compression and decent leakdown. Was a rebuild at some point with around 50k on it when I got it. So it's just over 200k now. Lots of piston rattle. But fires right up with no knocking or smoke, even after sitting for a year.
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  #14  
Old August 2nd, 2020, 19:30
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IslanderOffRoad IslanderOffRoad is offline
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Re: 2000xj running hot

Is the fan facing the correct direction?
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  #15  
Old August 2nd, 2020, 19:32
cherokeefan_1 cherokeefan_1 is offline
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Re: 2000xj running hot

Is it possible to put it on backwards? Lol. Yes, it's on correct.
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