jeep gets to 230 going up hill - JeepForum.com
 
LinkBack Thread Tools
post #1 of 14 Old 08-24-2017, 02:43 AM Thread Starter
flip_x
Registered User
1993 ZJ 
 
Join Date: Oct 2012
Location: Lake Tahoe
Posts: 11
jeep gets to 230 going up hill

Hello all.. I just recently replaced my Water pump, thermostat, Timing Chain, and Radiator.. Have the volvo fan setup.

I got the Radiator from Radiator Express went with the all aluminum one, FlowKooler Waterpump, Robertshaw 330-195 Thermostat.
it idles and drives at highway speeds below 210, but once i go up the mountain it starts getting to 230-240 temp, im lost ive removed all the air. i thought it was the temp sensor so i use a IR therm gun.
Do you think its the thermostat? it doesnt say it fits our jeep. but it fits in there.. im thinking it doesnt open all the way since its a balanced thermostat style.

Thanks in advance!!

Cedric

Jeep Zj 5.2

flip_x is offline  
Sponsored Links
Advertisement
 
post #2 of 14 Old 08-24-2017, 06:15 AM
LouC
Registered User
2007 WK 
 
Join Date: Feb 2008
Location: NY
Posts: 2,085
You can test it in a pot of water hanng it by a coat hanger wire. It should fully open by before you start to see bubbles signaling the water is about to boil (spec is 195*). We had an issue with ours (still had the OE stat in there at 19 years old and 175,000 miles). It would let the engine get to about 220 before the stat opened. Replaced it with an OE Mopar unit and it's all good. Most it gets to now is 210 usually under that.

2017 JK Unlimited Sport 6 spd
2007 WK Limited Hemi QDII
1998 ZJ Laredo 4.0 Selectrac
LouC is offline  
post #3 of 14 Old 08-24-2017, 06:46 AM
StPaul59
Registered User
1998 ZJ 
 
Join Date: Mar 2013
Location: St Paul
Posts: 984
Probably something up with the fan setup
StPaul59 is offline  
 
post #4 of 14 Old 08-24-2017, 10:12 AM
jeepjeepster
Registered User
 
Join Date: Dec 2004
Posts: 3,173
The stat doesnt say it fits your Jeep or the rad doesnt say it fits your Jeep? How did you know what to buy if it didnt say it worked in your Jeep?

Typically when an engine warms up on long grades its an issue with removing the heat, IE, the radiator, tstat not opening all the way, or possibly the water pump. I would just get a mopar tstat and install it. No reason to get a fancy tstat.

If it doesn't overheat at idle then the fan typically isn't the issue.

1994 ZJ-I6 w/216,000 mi
1998 ZJ 5.9 w/65,155 mi Slate Black
2004 KJ w/90,300 mi
jeepjeepster is offline  
post #5 of 14 Old 08-24-2017, 10:15 AM
BorderWalker
Registered User
1995 ZJ 
 
Join Date: Nov 2012
Location: Waltham, MA
Posts: 1,281
Garage
That T-Stat makes me Question. I'd swap it for a Stant T-Stat myself [As long as it's not one of the fail safe ones. Avoid like the plague those].

._________.ooooo.
/ŻŻŻ|ŻŻ|ŻŻ\ŻŻŻŻŻ\,____
L/ŻŻ\\__|__|"/ŻŻŻ\=llllll=\
_(Ż))===)).....(Ż))===))Ż
BorderWalker is online now  
post #6 of 14 Old 08-24-2017, 10:39 AM
kg6mov
Hears the voices
 
kg6mov's Avatar
1996 ZJ 
 
Join Date: Nov 2012
Location: Cupertino
Posts: 13,815
The stat is certainly a good thing to swap.

I'm wondering what you have for trans cooling, and wether it climbs up to 230 if you go up the hill with the OD off.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
kg6mov is offline  
post #7 of 14 Old 08-24-2017, 04:44 PM
mikem350
Registered User
1994 ZJ 
 
Join Date: Sep 2014
Location: Sunrise
Posts: 208
Make sure the fan and shroud are sealed to the rad (no gaps). If the fan has a hi/lo setting, its on hi?

Proud owner of two ZJs
Red 94 mint!
Silver 98 just hit 300k miles....runs like new!
mikem350 is offline  
post #8 of 14 Old 08-24-2017, 05:27 PM Thread Starter
flip_x
Registered User
1993 ZJ 
 
Join Date: Oct 2012
Location: Lake Tahoe
Posts: 11
Quote:
Originally Posted by jeepjeepster View Post
The stat doesnt say it fits your Jeep or the rad doesnt say it fits your Jeep? How did you know what to buy if it didnt say it worked in your Jeep?

Typically when an engine warms up on long grades its an issue with removing the heat, IE, the radiator, tstat not opening all the way, or possibly the water pump. I would just get a mopar tstat and install it. No reason to get a fancy tstat.

If it doesn't overheat at idle then the fan typically isn't the issue.

Everything i bought fits my jeep except the stat. i bought it because it said it worked for mopar.
but it seems to work fine. it holds at 195. even with ac on in 90 weather.. I feel like it cant open all the way and bottoms out on the intake manifold.

I also noticed today when i turn the jeep off when its showing the next tick mark after the middle. and turn it back on it shows 210. im thinking the hot air is messing with my readings and the temp sensor. with the air moving around where i have my bmw sensor at it shows 220. but with the fan off engine off it shows 208. so i have a few theories i need to figure out..

thanks!
flip_x is offline  
post #9 of 14 Old 08-24-2017, 05:32 PM
StPaul59
Registered User
1998 ZJ 
 
Join Date: Mar 2013
Location: St Paul
Posts: 984
A mystery t stat may do it. I quit reading right before that
StPaul59 is offline  
post #10 of 14 Old 08-25-2017, 10:11 AM
Boone96ZJ
Registered User
1996 ZJ 
 
Join Date: Jul 2014
Location: Boone
Posts: 274
my 5.2 does this as well but only with the AC on going up hill or in traffic. I have a new pump, tstat (stant 195), housing, hoses etc. I have a mechanical fan though. Technically 230 is fine for your engine since it is under pressure and can handle all the way to 260 according to the FSM.

96 5.2 242 3" 32x11.5
http://www.jeepforum.com/forum/f13/1996-grand-cherokee-laredo-5-2-a-2570290/
Boone96ZJ is offline  
post #11 of 14 Old 08-25-2017, 12:55 PM
Uniblurb
Web Wheeler
 
Uniblurb's Avatar
1996 ZJ 
 
Join Date: Jan 2012
Location: Central
Posts: 8,630
Quote:
Originally Posted by flip_x View Post
Everything i bought fits my jeep except the stat. i bought it because it said it worked for mopar.
but it seems to work fine. it holds at 195. even with ac on in 90 weather.. I feel like it cant open all the way and bottoms out on the intake manifold.
Yeah, you may want to back to a Mopar 195 T-stat and I've found the regular Stant ones work OK.


Quote:
Originally Posted by flip_x View Post
I also noticed today when i turn the jeep off when its showing the next tick mark after the middle. and turn it back on it shows 210. im thinking the hot air is messing with my readings and the temp sensor. with the air moving around where i have my bmw sensor at it shows 220. but with the fan off engine off it shows 208. so i have a few theories i need to figure out..

thanks!
Believe the stock 93 5.2 has 2 coolant temp sensors. One near T-stat housing behind AC compressor for feeding info to the PCM and the 2nd is behind the alternator while just a gauge sending unit. Then with 96 OBD2 there's only 1 CTS with the PCM feeding info to the gauge.

Do you have some other gauge CTS or sending unit setup since you mention BMW with air moving around it? Sounds odd the gauge temp would not read the same with engine/fan running vs neither running with key on right after shut-down.

96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 96 4.0 XJ (son's)


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
&
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.
Uniblurb is offline  
post #12 of 14 Old 08-25-2017, 02:35 PM
PolkaPower
Registered User
1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss
Posts: 21,424
Quote:
Originally Posted by Boone96ZJ View Post
my 5.2 does this as well but only with the AC on going up hill or in traffic. I have a new pump, tstat (stant 195), housing, hoses etc. I have a mechanical fan though. Technically 230 is fine for your engine since it is under pressure and can handle all the way to 260 according to the FSM.
That might be ok for the motor but not the transmission. Unless you bypass the radiator cooler the motor and transport temperatures affect each other.
Stock ZJ transmission cooling is pretty terrible unless you have a stock transmission cooler and even then those are small.
PolkaPower is online now  
post #13 of 14 Old 08-26-2017, 09:45 AM
Boone96ZJ
Registered User
1996 ZJ 
 
Join Date: Jul 2014
Location: Boone
Posts: 274
Quote:
Originally Posted by PolkaPower View Post
That might be ok for the motor but not the transmission. Unless you bypass the radiator cooler the motor and transport temperatures affect each other.
Stock ZJ transmission cooling is pretty terrible unless you have a stock transmission cooler and even then those are small.
I have an external trans cooler hooked to my 44re. Trans cooler in radiator isn't hooked up at all.

Sent from my SM-G920V using Tapatalk

96 5.2 242 3" 32x11.5
http://www.jeepforum.com/forum/f13/1996-grand-cherokee-laredo-5-2-a-2570290/
Boone96ZJ is offline  
post #14 of 14 Old 10-14-2017, 01:59 PM
Lithgow
Registered User
1998 ZJ 
 
Join Date: Aug 2016
Location: El Paso
Posts: 30
Just curious if you ever resolved this? Seems to be somewhat common with the 5.2?

1998 ZJ 5.2L 44RE 242TC 3.73's OME, lockers
2006 Silverado 2500 6.0 4X4
1993 Dodge diesel 4x4
Lithgow is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome