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Old 07-12-2010, 06:03 PM   #1
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OK this is not normal........ help!

Got my new Jeep a week ago. Seemed to run hotter at stops.
Thought after reading manual that this could just be normal.....

OK So now I do not think things are normal at all.....

Took Jeep out into town (15 miles) and she drove great and temp was
170-180 driving 60mph to town. At lights it warmed up to 190-200.

Drove home and its 98 degrees. Same temps until I get to driveway.
Its gravel and uphill 1/2 mile to house. At garage temp starts to climb up
to 240!!! I increase RPM to bring it down. it comes down to 210. I
turn off engine and go in house. Come out later and see coolant on
the garage floor and it looks like it came out of overflow tank. And
a little running down from Rad cap or hose to overflow.

this is not normal.... I think the problem is not getting enough
air flow when stopped at idle. This Jeep has the radiator, condenser
for a/c, and then the PO put a tranny cooler... right in front of condenser.
Plus they zip tyed in thru the condenser and they are touching.... no airflow.

What is the solution? I can try and move the Tranny cooler, but its
HUGE.... like 11"x14" and covers the entire condenser. Would you
hang it lower on a fab'ed up bracket? Or would seperating it from the
condenser allow for cooler running? Or just get rid of it?

Sorry for long post, but I am kinda bummed.... love my new Jeep
but this set-up is not working.... ideas?

Thanks,

T

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Old 07-12-2010, 06:33 PM   #2
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i maybe new but what are you running Do you have a 2.5 or 4.o. Do you have electric fans thermostat good in it? electric fans definatly help. I know they help out in alot of my other cars and bikes. just a thought

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Old 07-12-2010, 06:37 PM   #3
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take the radiator out and power wash straight down on it be carful not to bend the fins!
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Old 07-12-2010, 06:41 PM   #4
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Hey sorry I forgot about that. Its an 89 w/ a 4.2 I6. The PO replaced
the radiator, fan clutch and waterpump about 15k miles ago in 2005. Tranny
cooler went in before that in 2001. Just has the mechanical engine fan.
No electric fan.

T
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Old 07-12-2010, 06:53 PM   #5
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What about your fan clutch?
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Old 07-12-2010, 07:02 PM   #6
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I agree with fan clutch. I also tend to change the thermostat since its cheap. just because it was replaced don't make it good.
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Old 07-12-2010, 08:30 PM   #7
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I thought about the thermostat too. He replaced the fan clutch in 2005, but
I am ruling nothing out. How can I tell if its working correctly?

T
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Old 07-12-2010, 08:39 PM   #8
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May also have a bad pressure cap on radiator
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Old 07-12-2010, 08:46 PM   #9
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Is the fan shroud intact? The plasctic piece behind the radiator (facing the fan)?
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Old 07-12-2010, 08:49 PM   #10
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with the engine off spin the fan by hand . it should feel like it is dragging .
it should NOT spin freely .
if it does the fan clutch is bad.
also buy a good thermostat like a fail safe / no fail
a cheap thermostat will stay shut when it goes bad where as a good on like a fail safe will stay open if it goes bad allowing the water to flow freely thru the system.
also make sure you have good hose's a weak hose can be squeezed shut by the pressure of the vacuum caused by the water pump at high speed if it is too soft and weak.
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Old 07-12-2010, 09:54 PM   #11
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Ok... thanks for the ideas guys. I really appreciate it.

I can get a new radiator cap. It looks brand new, but ya never know.

The shrould up against the radiator is intake. Small, only a couple
inches deep, but it is there.

The Fan clutch does has some resistance when I spin it. Not free-wheelin.

I can repalce the thermostat with a good one. Not sure what he used.

He put the tranny cooler on to pull a small trailer. He said he did not
have overheating issues before this, he is just anal. But, he did
tell me when I was buying it that he wanted me to look into taking
the tranny cooler off because he thought it may be causing hot running....

Is anyone concerned about the fan trying to pull air through a
radiator... a condenser, AND a tranny cooler literally touching the
condenser? It only runs hotter as you stop and sit and the fan is
running slower... Just curious... it seems like kind of a bad setup?

Thanks again,

T

T
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Old 07-12-2010, 10:30 PM   #12
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I think the thermostat first.
you are report a heck of a lot more fluctuation in temps that I see in my TJ.
I start the engine....within about 8 minutes I'm at 210 degrees and it sits there...never moves. highway or stop light.... rock-solid 210.
It is certainly POSSIBLE that the tranny cooler will add to the heat being sucked through the radiator, I'd leave that step for later.
just my opinion.
Also, make sure you arte using the right BLEND of coolant. I know, its a no-brainer, but some folks miss the simple stuff.
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Old 07-12-2010, 11:40 PM   #13
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I am not familiar with the 1989 Jeeps, but was the 4.0 bored out to a 4.2 L? If it was bored then there is your problem. I bored out my 4.0 to a 4.2 and then I could not keep the engine cool when idling in hot weather or when crawling. I did not have this problem before the modifications to the engine. The stock radiator just could not cut it and I had to replace it with a 3 core radiator and a cooler thermostat.
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Old 07-13-2010, 12:51 AM   #14
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Quote:
Originally Posted by Tat2 View Post
I thought about the thermostat too. He replaced the fan clutch in 2005, but
I am ruling nothing out. How can I tell if its working correctly?

T
Pull the thermostat and take it into the house, boil some water and put the thermostat into the boiling water you should see it open. Test complete.
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Old 07-13-2010, 01:01 AM   #15
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Quote:
Originally Posted by doclouie View Post
I am not familiar with the 1989 Jeeps, but was the 4.0 bored out to a 4.2 L? If it was bored then there is your problem. I bored out my 4.0 to a 4.2 and then I could not keep the engine cool when idling in hot weather or when crawling. I did not have this problem before the modifications to the engine. The stock radiator just could not cut it and I had to replace it with a 3 core radiator and a cooler thermostat.
The I6 4.2 was the upgrade 6 until 1990. After 90' they changed to the 4.0, which had more power and better fuel economy. Also the 4.2 had a carb not EFI.

Take the trans cooler off.... do you tow with it? Clean out your radiator, if you have a compressor I'd blow air through the backside before you use a hose on it. We have problems in my line of work with pressure washers not getting the condensers clean enough so our first step is an air gun with around 120PSI. You'll be amazed how much dirt is packed in there. Clean your engine. A dirty engine will run hotter. Sounds unlikely but oily dirt holds in the heat and contributes to your problem. Last see how far your fan goes into the fan shroud. Do you still have a fan shroud on your radiator?

If not you may want to think about making one or buying one. The deeper inside the shroud your fan is the better it will suck air through your radiator.

A few simple things to start with.... Good luck!
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Old 07-13-2010, 01:29 AM   #16
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The I6 4.2 was the upgrade 6 until 1990. After 90' they changed to the 4.0, which had more power and better fuel economy. Also the 4.2 had a carb not EFI.

Take the trans cooler off.... do you tow with it? Clean out your radiator, if you have a compressor I'd blow air through the backside before you use a hose on it. We have problems in my line of work with pressure washers not getting the condensers clean enough so our first step is an air gun with around 120PSI. You'll be amazed how much dirt is packed in there. Clean your engine. A dirty engine will run hotter. Sounds unlikely but oily dirt holds in the heat and contributes to your problem. Last see how far your fan goes into the fan shroud. Do you still have a fan shroud on your radiator?

If not you may want to think about making one or buying one. The deeper inside the shroud your fan is the better it will suck air through your radiator.

A few simple things to start with.... Good luck!
Hey thanks for the ideas.

Yes the shroud is still there. Like new. Motor
is SO clean. I could eat off of it. PO was 63
and retired. LOTS of time on his hands.

I am going to check out the Thermostat. Seems weird.... Plus, no I do not tow. I am going to try moving traany cooler if I can before I remove it. If not I will take it off and just run tranny cooling
thru the radiator again. I will clean out radiator too. He did put it on there 5 years ago......

Again, I really appreciate all the help guys.

T
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Old 07-13-2010, 01:31 AM   #17
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Keep us posted on your progress.
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.....we hold that the Second Amendment right is fully applicable to the States.
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Old 07-13-2010, 01:56 AM   #18
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I will Chris. thanks for the help. I work out of town
and leave tomorrow. So she is gunna have to heal up
in the garage until I get back friday night........

T
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Old 07-13-2010, 04:54 AM   #19
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Quote:
Originally Posted by Tat2 View Post
Hey sorry I forgot about that. Its an 89 w/ a 4.2 I6. The PO replaced
the radiator, fan clutch and waterpump about 15k miles ago in 2005
. Tranny
cooler went in before that in 2001. Just has the mechanical engine fan.
No electric fan.

T
Have you pulled the dipstick and looked for any signs of water in the oil?

As much as I hate to say it I suspect that this was an existing problem that the PO threw parts at, didn't get it fixed and decided to sell it.
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Old 07-13-2010, 05:31 PM   #20
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Quote:
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Have you pulled the dipstick and looked for any signs of water in the oil?

As much as I hate to say it I suspect that this was an existing problem that the PO threw parts at, didn't get it fixed and decided to sell it.
I have known him for years and will see him twice a month for years to come. He was very forward about it and said he never had problems until they put on this tranny cooler. Thats why he was going to pay to take it off and the a/c if need be. I told him no do not pay someone. If need be its not that hard and I will do it.

I think he replaced things trying to go thru the options of what could be causing the issue. But I still think I need to move this tranny cooler.

I am going to put a GOOD thermostat it and move the Tranny cooler
when I get home. We shall see. But thanks for your input.

T
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Old 07-14-2010, 01:37 PM   #21
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Hey guys,

I am sitting in the hotel thinking about this.... and it seemed to me that
maybe not enough of the engine fan was into the shroud???? My
understanding is that the fan should be 1/2 in and 1/2 out of the shroud?

So since its having problems getting warm only when say at lights in town
or basically fan turning slower..... could the shroud/fan relationship be it???

T
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Old 07-14-2010, 04:19 PM   #22
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remove the trans cooler and see what happens. could be blocking air flow.
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Old 07-14-2010, 10:11 PM   #23
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how new is your serpentine belt, and is it tentioned properly? i have not seen an aftermarket trans cooler cause this issue before but its possible. but i have seen a few rad caps go bad and cause these same symptoms...one was on a 3yo car.

my .000002 cents
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Old 07-15-2010, 12:40 AM   #24
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how new is your serpentine belt, and is it tentioned properly? i have not seen an aftermarket trans cooler cause this issue before but its possible. but i have seen a few rad caps go bad and cause these same symptoms...one was on a 3yo car.

my .000002 cents
I will put the new radiator cap on the list w/ moving the tranny cooler
for when I get back into town. I really want to get this fixed.......

Thanks again guys for all the input. Kind of a bummer to have a
new Jeep and it does not like to go offroad and slow...... LOL
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Old 07-15-2010, 01:04 AM   #25
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I will put the new radiator cap on the list w/ moving the tranny cooler
for when I get back into town. I really want to get this fixed.......

Thanks again guys for all the input. Kind of a bummer to have a
new Jeep and it does not like to go offroad and slow...... LOL
Try mine.. it almost caught on fire the first day I had it Dont get down. As we say to the customers at work.. "It's a machine, they break." You'll get her sorted out.
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Old 07-15-2010, 01:47 AM   #26
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Try mine.. it almost caught on fire the first day I had it Dont get down. As we say to the customers at work.. "It's a machine, they break." You'll get her sorted out.
Yeah thanks dude! I did LMAO reading your post about driving yours home!
I just wanna get home and start getting at her. Gotta be one of the above...

T
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Old 07-17-2010, 11:14 PM   #27
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Got home and got to drive the YJ again. Drove it in the morning and
it was 75 degrees. Ran at 175-180 until stopping at ATM and it went up
to around 220 and then I could see it jump down to 190'ish. I think that
the Thermostat was opening and dumping the temp down. Think its working.

Ran it in the afternoon at 96 degrees. Ran same 175-185 at 65mph.
And it looked like the thermostat was still opening if I stopped at a light
and temp came back down. Did not overheat in town.

Ran it back to house w/ a 1/2 mile climb to house. Got up to 230 in
driveway after climbing hill. Had to run up rpm in neutral for 3-4 minutes
to get it to come down to 180. Turned it off and it did not overheat.

I still am planning on removing the tranny cooler. At slow speeds and
putting a load on it, it still seems to get hot. But it is controllable.

T
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Old 07-18-2010, 12:59 AM   #28
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I forgot, but I may have found part of it this morning. I checked the
fluid in the overflow and radiator this morning before leaving. When I
tried to put the radiator cap back on it would catch on the overflow hose
clamp and not press down as I was turning it. I moved the clamp flat
so that it would clear going on and it seemed like th cap set down farther when I twisted it on. Maybe it was not pressurizing right??

T
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Old 07-19-2010, 09:49 PM   #29
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Ok. I finally took the tranny cooler out.......



I could never feel the fan pulling air before, but
I put my hand in front of condenser and could
feel the fan pulling alot of air through now!

It was 90 degrees today and I drove it all over town with the cooler out thru stop and go traffic and up to highway speeds. It definitely ran cooler. Not a ton, but like 10-15 degrees cooler at 60mph. And in town I never shifted it into N to cool it and it pretty much stayed at 210 and below. Once in went up to 220, but never climbed any higher.

On the crawl up to the house I went slower than normal ( 10-15 mph ) and it did hit 230 at the house. But I just goosed it once and it dropped
to 210 immediately. Waayy better than before.

I may change out the Temp gauge since it seems to stick alittle and jump.

But overall its way better with the tranny cooler out. If needed for slow crawling thru the woods, I may look into a better ALL Aluminum radiator.

Thanks for the ideas guys! Step one is working!

T
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Old 07-20-2010, 06:29 AM   #30
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as mentioned by some of the guys above, make sure your rad is clean. I mean that there is no mud and dirt inside the fins. Mine did the exact same thing when I bought it. The previous owner replaced hoses, cap, thermastat, fan clutch, and it would still get hot in traffic and only start to cool when moving faster. He was frustrated and sold it to me. I could not believe how much dirt and mud was clogged inside. took me a long time with air and water to clean out the fins. Results> runs 175 to 190 in traffic all day.

you can also add a small aux electric fan cooler to come on at a certain temp which always works great especially with a/c.

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