Overheating Problem

Rytchayrd · 03-04-2010, 03:06 PM

I have been chasing an overheating problem. The temrature was running about 240. When I got home I figured the water pump or thermostat. I took the water pump off and it seemed ok, no play or leaks. I did put a new t-stat, while I was doing this I noticed this brown stuff that felt like silly puddy. This stuff was all through my radiator I had another one which I installed, then I flushed the heater core. I drove it for about 4-5 miled and it did the same thing. I guess I should have flushed the system first, which I will do tomorrow, I was wondering if anyone had any ideas what is causing my problems. Thanks.

91familyxj · 03-04-2010, 03:13 PM

I would try flushing it all out first and get all that crap out of there and see what happens.

djb383 · 03-04-2010, 04:29 PM

I would pull the rad, take it to a rad shop and have it rodded out. Flush the heater core and engine block as good as you can and change coolant more often. Any brown in the cooling system means coolant/antifreeze is way past it's prime and should have been flushed/changed a while back.

captainofiron · 03-04-2010, 04:56 PM

after you flush the system make 100% sure you got all the air out, and use a quality t-stat. Im speaking from experience, my jeep was sidelined for almost a month while I was trying to chase down an overheating problem

Rytchayrd · 03-04-2010, 07:01 PM

Thanks, I'll flush the system first thing tomorrow.

SHO_91 · 03-04-2010, 08:06 PM

A while back I ran into the same thing, overheating issue, with a Chevy. Did a flush and got some gunky brown stuff coming out. The problem didn't go away, however, and it got so bad that one day one of the radiator plastic side tanks blew. The original owner told me he put some Bar-S radiator seal in it due to a small leak. I took the radiator to a shop and had it tested, they found out that the rad core was hopelessly plugged up. New rad fixed the issue. I'd strongly advise against any kind of radiator sealing agent. If it leaks, have if fixed properly.

Rytchayrd · 03-06-2010, 09:41 AM

I had to flush my system 4 times before I got all the crap out of the engine. Looks like years of neglect on my part, I've hade the Jeep for 6 years and it has 169,000 on it. I took it for a short drive and it held temp about 210. I am getting ready take it for a longer drive now, so thaks for your help.

mycherokee · 03-06-2010, 09:54 AM

Flushing the system is always a good annual thing to do.

McRay · 03-06-2010, 11:58 AM

might try check temp with manual gauge - some times the temp sensor starts to go bad and reads a little high. Before doing a lot of work.

Rytchayrd · 03-06-2010, 12:43 PM

I drove it today for about 20 minutes and the heater was running cool, but the temp was about 210. Then I went out for a short drive and the heater worked. Another short drive to run some errands and the temp went up to about 240, so I turned the heater on full and the temp came back down. As I got home I checked the radiator and the coolant had a light brown color, do I have blown gasket or do I need to keep flushing?

Rytchayrd · 03-06-2010, 01:42 PM

I am wondering if I got a faulty t-stat, because I drove it again and no problem?

PhilipF18 · 03-06-2010, 02:10 PM

i would yes flush the entire system and check to see if a new radiator will help i know that mine kept overheating and my rad was full of all kinds of *****. putting a new one in made it all better.

Rytchayrd · 03-10-2010, 06:20 PM

Just an update, I have flushed my cooling system several times and that is definately my problem. It looks like I had a couple different problems at once. The t-stat was bad, I never did replace my coolant or flush the system, and some where along the line stop-leak was used. So after a new radiator, t-stat, and still flushing, it has not over heated since.

Rytchayrd · 03-10-2010, 06:21 PM

Oh and thanks for your suggestions and help, it is greatly appreciated.

SHO_91 · 03-12-2010, 11:10 PM

My coolant looks disgustingly brown also, so on the weekend I will try to find the drain cock (prolly at the bottom of the rad) and have at it. To my excuse, I've only had this Jeep for about 2 months now, and I haven't had a problem with it, save for the repulsive look of that coolant. :O

03-04-2010, 03:06 PM	#1
Rytchayrd Newbie Join Date: Feb 2010 Location: Central Pennsylvania Posts: 7 My Photos 1999 Cherokee Year: 1999 Model: Cherokee Engine: 4.0 I6 Transmission: AOD Transfer Case: SelecTrac Tires: Goodyear Wrangler Lift Specifications: Stock	Overheating Problem I have been chasing an overheating problem. The temrature was running about 240. When I got home I figured the water pump or thermostat. I took the water pump off and it seemed ok, no play or leaks. I did put a new t-stat, while I was doing this I noticed this brown stuff that felt like silly puddy. This stuff was all through my radiator I had another one which I installed, then I flushed the heater core. I drove it for about 4-5 miled and it did the same thing. I guess I should have flushed the system first, which I will do tomorrow, I was wondering if anyone had any ideas what is causing my problems. Thanks.

03-04-2010, 04:56 PM	#4
captainofiron Seasoned Member Join Date: Apr 2009 Location: Las Cruces New Mexico Posts: 451 My Photos 1991 Cherokee Year: 1991 Model: Cherokee Engine: 4.0 I-6 H.O. Transmission: AX-15 Transfer Case: NP-231 Front Axle: Dana 30 with disconnect Rear Axle: Dana 35 Tires: 33x12.50-15 Mickey Thompson Baja Claws Lift Specifications: RE 3 Super Flex Misc Accessories: Jack In the Box antenna ball	after you flush the system make 100% sure you got all the air out, and use a quality t-stat. Im speaking from experience, my jeep was sidelined for almost a month while I was trying to chase down an overheating problem __________________ www.fquick.com/Captainofiron 97 Pontiac Trans Am WS-6, LT1 factory 4bolt freak, M6, 91 Jeep Cherokee 2 Door, 4X4 NP 231 TC, AX15 M5 68 Pontiac Firebird 400, YC 400, 670 heads M4 65 Chevrolet Impala SS, 327 V8, M20 M4 12 bolt 3.73 gears

03-06-2010, 11:58 AM	#9
McRay Member Join Date: Feb 2009 Posts: 134 My Photos 1996 & 2001 Cherokee Year: 1996 & 2001 Model: Cherokee Engine: 4.0 Transmission: aisin aw 30-43LE	might try check temp with manual gauge - some times the temp sensor starts to go bad and reads a little high. Before doing a lot of work. __________________ 1996 Jeep Cherokee 2 WD Engine 4.0 Transmission Aisin AW 30-43LE 2001 Jeep Cherokee Sport Conroe, Tx

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03-04-2010, 03:13 PM	#2
91familyxj CF Veteran Join Date: Aug 2009 Location: Las Vegas Posts: 1,031 My Photos 1991 Cherokee Year: 1991 Model: Cherokee Engine: 4.0 Transmission: Aw4 Transfer Case: NP242 J Front Axle: Dana 30 Rear Axle: Crysler 8.25 Tires: BFG A/T 30x9.5x15 Lift Specifications: 3.5'' Rubicon springs up front and a little over 4 inches in the rear. Misc Accessories: steel dwindow rims, magnaflow exhaust fully welded, fishing pole rack inside.	I would try flushing it all out first and get all that crap out of there and see what happens.

03-04-2010, 04:29 PM	#3
djb383 Senior Member Join Date: Nov 2009 Location: Midland, TX Posts: 563 My Photos 1998 Cherokee Year: 1998 Model: Cherokee Engine: 4.0L HO Transmission: Auto Transfer Case: N/A, 4X2 Rear Axle: 3.55 Tires: 235/70/15 Lift Specifications: Stock Misc Accessories: Magnaflow 2 1/2" exhaust	I would pull the rad, take it to a rad shop and have it rodded out. Flush the heater core and engine block as good as you can and change coolant more often. Any brown in the cooling system means coolant/antifreeze is way past it's prime and should have been flushed/changed a while back.

03-04-2010, 07:01 PM	#5
Rytchayrd Newbie Join Date: Feb 2010 Location: Central Pennsylvania Posts: 7 My Photos 1999 Cherokee Year: 1999 Model: Cherokee Engine: 4.0 I6 Transmission: AOD Transfer Case: SelecTrac Tires: Goodyear Wrangler Lift Specifications: Stock	Thanks, I'll flush the system first thing tomorrow.

03-04-2010, 08:06 PM	#6
SHO_91 Member Join Date: Mar 2010 Location: Phoenix, AZ Posts: 102 My Photos 96 Cherokee Year: 96 Model: Cherokee Engine: 2.5l I-4 Transmission: 5-speed manual	A while back I ran into the same thing, overheating issue, with a Chevy. Did a flush and got some gunky brown stuff coming out. The problem didn't go away, however, and it got so bad that one day one of the radiator plastic side tanks blew. The original owner told me he put some Bar-S radiator seal in it due to a small leak. I took the radiator to a shop and had it tested, they found out that the rad core was hopelessly plugged up. New rad fixed the issue. I'd strongly advise against any kind of radiator sealing agent. If it leaks, have if fixed properly.

03-06-2010, 09:41 AM	#7
Rytchayrd Newbie Join Date: Feb 2010 Location: Central Pennsylvania Posts: 7 My Photos 1999 Cherokee Year: 1999 Model: Cherokee Engine: 4.0 I6 Transmission: AOD Transfer Case: SelecTrac Tires: Goodyear Wrangler Lift Specifications: Stock	I had to flush my system 4 times before I got all the crap out of the engine. Looks like years of neglect on my part, I've hade the Jeep for 6 years and it has 169,000 on it. I took it for a short drive and it held temp about 210. I am getting ready take it for a longer drive now, so thaks for your help.

03-06-2010, 09:54 AM	#8
mycherokee Seasoned Member Join Date: Dec 2009 Location: Salina, KS Posts: 376 My Photos 1989 Cherokee Year: 1989 Model: Cherokee Engine: 4.0l I6 Transmission: Automatic Transfer Case: 4x4 Tires: 235/75/15 Lift Specifications: Stock	Flushing the system is always a good annual thing to do.

03-06-2010, 12:43 PM	#10
Rytchayrd Newbie Join Date: Feb 2010 Location: Central Pennsylvania Posts: 7 My Photos 1999 Cherokee Year: 1999 Model: Cherokee Engine: 4.0 I6 Transmission: AOD Transfer Case: SelecTrac Tires: Goodyear Wrangler Lift Specifications: Stock	I drove it today for about 20 minutes and the heater was running cool, but the temp was about 210. Then I went out for a short drive and the heater worked. Another short drive to run some errands and the temp went up to about 240, so I turned the heater on full and the temp came back down. As I got home I checked the radiator and the coolant had a light brown color, do I have blown gasket or do I need to keep flushing?

03-06-2010, 01:42 PM	#11
Rytchayrd Newbie Join Date: Feb 2010 Location: Central Pennsylvania Posts: 7 My Photos 1999 Cherokee Year: 1999 Model: Cherokee Engine: 4.0 I6 Transmission: AOD Transfer Case: SelecTrac Tires: Goodyear Wrangler Lift Specifications: Stock	I am wondering if I got a faulty t-stat, because I drove it again and no problem?

03-06-2010, 02:10 PM	#12
PhilipF18 Newbie Join Date: Mar 2010 Location: Yucaipa CA Posts: 24 My Photos 1989 Cherokee Year: 1989 Model: Cherokee Engine: 4.0l I6 Transmission: stock Transfer Case: stock Front Axle: stock Rear Axle: dana 35 Tires: BFG's KM2 32x11.5 on 15's Lift Specifications: zone offroad 3inch Misc Accessories: xrc8 wich, home made bumper, roofrack, kc lights and cb	i would yes flush the entire system and check to see if a new radiator will help i know that mine kept overheating and my rad was full of all kinds of *****. putting a new one in made it all better.

03-10-2010, 06:20 PM	#13
Rytchayrd Newbie Join Date: Feb 2010 Location: Central Pennsylvania Posts: 7 My Photos 1999 Cherokee Year: 1999 Model: Cherokee Engine: 4.0 I6 Transmission: AOD Transfer Case: SelecTrac Tires: Goodyear Wrangler Lift Specifications: Stock	Just an update, I have flushed my cooling system several times and that is definately my problem. It looks like I had a couple different problems at once. The t-stat was bad, I never did replace my coolant or flush the system, and some where along the line stop-leak was used. So after a new radiator, t-stat, and still flushing, it has not over heated since.

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03-10-2010, 06:21 PM	#14
Rytchayrd Newbie Join Date: Feb 2010 Location: Central Pennsylvania Posts: 7 My Photos 1999 Cherokee Year: 1999 Model: Cherokee Engine: 4.0 I6 Transmission: AOD Transfer Case: SelecTrac Tires: Goodyear Wrangler Lift Specifications: Stock	Oh and thanks for your suggestions and help, it is greatly appreciated.

03-12-2010, 11:10 PM	#15
SHO_91 Member Join Date: Mar 2010 Location: Phoenix, AZ Posts: 102 My Photos 96 Cherokee Year: 96 Model: Cherokee Engine: 2.5l I-4 Transmission: 5-speed manual	My coolant looks disgustingly brown also, so on the weekend I will try to find the drain cock (prolly at the bottom of the rad) and have at it. To my excuse, I've only had this Jeep for about 2 months now, and I haven't had a problem with it, save for the repulsive look of that coolant. :O