overheat with ac on - Page 2 - JeepForum.com
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post #16 of 31 Old 06-12-2018, 12:59 PM
PolkaPower
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Originally Posted by Junior1210 View Post
Not sure yours counts, since it doesn't get that hot in NV. Only about 375* Kelvin.
What is that? Like 200* lol. It's not as hot up here in the North as it was in Las Vegas but it still gets a bit toasty!

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post #17 of 31 Old 06-12-2018, 01:30 PM
mkm5
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[QUOTE=4xphate;40242375]Ya know, I will check that in the morning. I believe I have the reverse pump but if it wasnt what was supposed to be there wouldnt it be more prone to overheat at idle? Im pretty sure the fins were the same but ya know how that goes.

I don't understand this reverse pump thing.

I have a stock 5.9L with a replacement hood that doesn't have vents. Hoping to add them soon to keep underhood temps down as Timo says; no need to bake everything under there any more than it already is.

That said, no matter what I do my Jeep never runs above the position shown in Polka's temp gauge pic, approximately 195-200 degrees. Once it gets to temperature, it never moves. Original radiator, A/C system, e-fan, hoses and sensors. Replaced thermostat with stock, water pump with AC/Delco (exact match), and bypass hose, along with 50/50 Zerex Original Green and distilled water last year.

A/C is often too cold on the "Lo" setting.
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post #18 of 31 Old 06-12-2018, 01:48 PM
Timo_90xj
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Quote:
Originally Posted by 4xphate View Post
Ya know, I will check that in the morning. I believe I have the reverse pump but if it wasnt what was supposed to be there wouldnt it be more prone to overheat at idle? Im pretty sure the fins were the same but ya know how that goes.
I don't understand this reverse pump thing.

Oh, yeah. There are standard and reverse rotation water pumps available for the 4.0 engines - at least there used to be.
One needs to be sure you get the correct pump. As for which is correct for the ZJ 4.0, I'm not 100% sure.


I have a gut feeling that it was either early XJ 4.0s ('87-'90 Renix) or the '01-> end of production 4.0s that used a different pump from the '91-'99 engines.
Again, I'd need to check but right now I'm too tired to do so

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #19 of 31 Old 06-12-2018, 01:56 PM
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I installed an a/c delco water pump in my 96 4.0 this weekend and it did not have the R stamped on the blades, but when I compared them the blades were oriented exactly the same as the one I was replacing that did have the R stamped on the blades?

-Tim
(2) '96 4.0s
#1-'10-'18
#2- HP30/Ford 8.8 - 4.56, OME HDs, 5100's, IRO Adj Arms/Track Bars
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post #20 of 31 Old 06-12-2018, 03:08 PM Thread Starter
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I think I may go with these, small and should fit back between hood braces well. This link isnt available powdercoated but they are from other places.
https://www.4wd.com/p/hyline-offroad...NE-075.500.110


Kinda want these but they are pretty big and dont come powdercoated. And I believe I could probably go with them later and cover smaller holes.



http://rodlouvers.com/Jeep-ZJ-Louver...-P5372090.aspx



I still think the reverse pump or not is a moot point, if it wasnt right it would overheat all the time and at idle.
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post #21 of 31 Old 06-14-2018, 09:16 AM
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I did this kit. Sold the long front louver to a Wrangler guy and used the other four louvers.

https://genright.com/products/hood-l...5pc-black.html
Enter code HAPPYDAD for a 15% discount.
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post #22 of 31 Old 06-14-2018, 01:11 PM Thread Starter
4xphate
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Quote:
Originally Posted by HighLonesome View Post
I did this kit. Sold the long front louver to a Wrangler guy and used the other four louvers.

https://genright.com/products/hood-l...5pc-black.html
Enter code HAPPYDAD for a 15% discount.



That has a pic of a guy cutting it out with a jigsaw, I have seen this other places also. Are y'all cutting thru the hood bracing also?
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post #23 of 31 Old 06-14-2018, 01:28 PM
Timo_90xj
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Are y'all cutting thru the hood bracing also?

I'd avoid cutting through the braces, but if you have to, do so. I like to be able to climb on my hood when needed without it deforming

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #24 of 31 Old 06-14-2018, 01:41 PM
HighLonesome
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Yea I was able to avoid the braces. I think...I guess I could go look.
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post #25 of 31 Old 06-14-2018, 02:53 PM
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Originally Posted by 4xphate View Post
That has a pic of a guy cutting it out with a jigsaw, I have seen this other places also. Are y'all cutting thru the hood bracing also?
If necessary. I used a grinder with a cut off wheel. Just a little bracing was removed.

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post #26 of 31 Old 06-14-2018, 03:03 PM
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Here's my writeup, not pretty but I mostly avoided cutting the braces.
https://www.jeepforum.com/forum/f13/g...-deux-3249185/
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post #27 of 31 Old 06-21-2018, 12:10 PM
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I wonder if these can be made to fit


https://www.hylineoffroad.com/jeep_p...j_hood_louvers

Follow the build!

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The 4.0 is dumb old tractor motor, itís too stupid to know itís supposed to die.
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post #28 of 31 Old 07-20-2018, 05:28 PM Thread Starter
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Im gonna bump this for future search purposes. The problem is solved. I had a brand new 4 seasons fan clutch on it. It seemed fine as long as ac wasnt on.Out of desperation and because it only cost time and money ( I would have never bought this jeep if I knew how much time and money )


Anyway went ahead and bought another fan clutch, Hayden this time. Problem fixed! They both looked and spun the same by hand.
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post #29 of 31 Old 07-20-2018, 09:38 PM
PolkaPower
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Quote:
Originally Posted by 4xphate View Post
Im gonna bump this for future search purposes. The problem is solved. I had a brand new 4 seasons fan clutch on it. It seemed fine as long as ac wasnt on.Out of desperation and because it only cost time and money ( I would have never bought this jeep if I knew how much time and money )


Anyway went ahead and bought another fan clutch, Hayden this time. Problem fixed! They both looked and spun the same by hand.
OEM works every time. Adding different stuff isn't always the best thing. Cracked heads will heat thing up too.

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post #30 of 31 Old 07-21-2018, 10:19 AM
MrRoundel
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My Jeep does this same thing. I replaced my A/C a couple of years ago and I think that I somehow got some atmosphere into the compressor. I don't think this is good for cooling. Besides that, I wonder if it's harder for the compressor to compress the mix, than it is the pure 134a gas? Thanks for the reminder. I'll probably take it in to have it evacuated, vacuumed tested, and filled this week. Good luck with your cooling issue.

1998 Laredo 4.0L 4x4, 242 TC. Turned over 200K miles in 06/18. Original owner.
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