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Jeep Grand Cherokee, Jeep Grand Cherokee SRT-8, Jeep Cherokee, Engine, SUV
#123 of 731 1990 Jeep Cherokee OVERHEATING!!
Mar 24, 2007 (6:21 am)
Well, I bought a 1990 Jeep Cherokee just 2 Days ago. It's Automatic Transmission, 6 Cylinder Inline Engine 4 wheel drive. The previous owner told me he had just replaced the water pump and thermostat, but didn't mention anything about an overheating problem. When We got it home I did a complete tune up, changed all the fluids and filters and such. I noticed, after the drive home, that there was water in the coolant reservoir. I figured that it was just becuase he had replaced the water pump, and thermostat, and wasn't wanting to waste coolant. After we had finished our tune up, we took it on a drive to see how it was doing. It drove just fine for 15 minutes, and started to heat up gradually until it was in the red. We pulled over, waited for a bit, and drove to a mechanic. He told us that because it was a closed system, it's very easy to get a bubble in it, and that it doesn't work to just fill up the reservoir. So, we unplugged the heat sensor in the back of the engine, and took off the main radiator hose. We filled up the Radiator with coolant, directly through the hose until we had a steady stream of coolant coming out of the back of the engine, where the heat sensor was. We than filled the reservoir up, and let her run. After about 5 minutes of idleing, the reservoir had emptied some, and so we filled it a little past half way to complete, and we figured the bubble was gone, and our overheating problems were over. a 25 minute drive around town confirmed that. However, we drove it a distance of around 65-70 miles last night to be able to get home, and it did just fine until we got about 10 to 15 miles from the destination and it started to over heat again. We pulled over, and it spued coolant all over the place. So, in the end, something's wrong. So, to finish off, just some last things I noticed..... 1.) We found a pinched radiator line that goes back to the transmission (it appears the transmission is cooled by the coolant as well???) 2.) When it gets hot, the coolant seems to bubble back into the reservoir,and is usually boiling inside the reservoir. 3.) The coolant seems to be a rusty brown color whenever it overheats. However, it was a lot less rusty the second time. I have a feeling that it is just a bad, corroded Radiator. But, I just don't know. I want to change from a closed, to an open system, and don't know I sure would appreciate any help. Thanks!!!
#124 of 731 Re: 1990 Jeep Cherokee OVERHEATING!! [cmbmbsps]
Mar 25, 2007 (7:20 pm)
prob have pluged rad would put new one on heaveyduty
trans has small cooler in side rad un pinch line for sure
#125 of 731 2000 Grand Cherokee overheating.....dont know why
Mar 27, 2007 (7:51 pm)
So I bought a 2000 grand cherokee on ebay (first mistake). IT has always run hot since I bought it about 3/4 or a little more on dash. So then one day it chimed and said check gages and it was almost on the red. I had the thermostat changed...nothing...so then we got into the water pump which was cracked. seemed to be fine after that. about 2 or 3 days later I was driving on the highway and overheated at 3/4 on the dash and the heat went cold. so I bled the cooling system to remove any air pockets, but now it still runs 3/4 or more on the highway... but in the city it runs just over 1/2. Any suggestions???? I would really appreciate any input.
#126 of 731 Re: 2000 Grand Cherokee overheating.....dont know why [tourpro]
Apr 03, 2007 (5:51 pm)
I have a 2000 Cherokee Sport, 4.0L, 4x4 and have had an overheating problem since 2005. It began to overheat so I took it in...had the radiator, thermostat, and head gasket replaced. It worked good for about a year and started to overheat again, but was okay as long as I kept filling it with coolant. About two weeks ago it wouldn't run at all without overheating. Just finished replacing the head gasket, water pump, thermostat, thermostat housing (it had cracked), and the radiator. I did it myself and just finished last Saturday. It ran perfect, had put about 250 miles on it, until today, on my way home it overheated. I am at a loss..is it possible the engine is bad?? It shouldn't be running that hot, and I know there is nothing wrong with the cooling system now, I just replaced the entire thing. Any suggestions?
#127 of 731 Re: Check Gage indicator & overheating [wfs340]
Apr 23, 2007 (9:17 am)
My son just purchased a 2000 GCL 4.0L with 74K miles.
While driving it home the temp gauge showed 240 degs.
I checked it out and found that the fan relay is bad:
AC engages, fan doesn't go on.
Temp exceeds 210 deg., fan doesn't go on.
Switched the 40 amp fuse in the PCM, fan doesn’t go on.
Hot wired, fan goes on.
Is the fan relay on a 2000 GCL 4.0L the same and in the same place as your 2003?
If not do you know where it is located?
#129 of 731 01 Cherokee Sport~New Cooling fan NOT working
May 09, 2007 (12:38 pm)
I'm having the "classic" cherokee overheating problems. DH has replaced thermostat, water pump, lower rad. hose, and cooling fan. I overheated yesterday on our first warm day after sitting at a drive thru for maybe 3-4 minutes.
So he hot-wired the cooling fan last night and it is not working. Have another one on the way. Could there be something making it "go bad?" Dh says he is going to direct wire the fan to a toggle switch, as he feels it does not run enough. Only comes on after it hits 210. ANy ideas? It's an 01 Cherokee Sport, with 129,000 on it. 40,000 when I bought it, and the overheating problems started at the end of last summer.
#130 of 731 Re: 01 Cherokee Sport~New Cooling fan NOT working [blackbird79]
May 12, 2007 (9:42 pm)
My info says the sub fan is supposed to come on at 223 f and shuts off at 217 f .the coolant temp sensor and the a/c high pressure switch are responsable for telling the pcm when to turn on the sub cooling fan, the pcm grounds the cooling fan relay.If it doesnt overheat on the freeway its problebly not a plugged radiator. . Check the fan clutch see if its pulling air through the radiator by holding a large piece of cloth in front of the grill and see if the mechnical fan is pulling the cloth inwards.
#131 of 731 Re: 01 Cherokee Sport~New Cooling fan NOT working [blackbird79]
May 13, 2007 (10:02 am)
My bet says that you have a partley pluged rad
#132 of 731 2001Jeep Grand Cherokee Overheating FIX
May 18, 2007 (3:42 pm)
My wife has a 2001 Jeep Grand Cherokee with 10014 miles it just started to overheat, it was fine when going down the road but when she would stop the temp gauge went off the scale. Called the jeep dealer who stated it was a very common problem, and we could drop it off monday and it would be fixed sometime in the afternoon tuesday. They stated it was a fan relay. The Jeep book gave 8.5 hours for the change and the part is $75.00 ish, so a total repair of about $400.00 to $500.00 total (time and parts).
To me this was alot of money for a relay switch, so I got a hold of a jeep repair manual and the repair started by stating that the bumper cover had to be removed, the grill, radiator, and head light assembly all had to be removed just to access the relay. Well I could see where the price came from. I did some checking and a friend had the same problem I had he took his jeep to the dealer, the repair man showed him to remove the passenger side head light assembly which is one torx screw and a 7mm head long bolt, the headlight comes out with a little tug and help of a med. screwdriver, the assembly pops out of several ball sockets and you rest it on the bumper, with the wires still attached. You then cut a 3" by 6" chunk of the plastic that the headlight sits on, I did mine with a cut off wheel, when I removed the chunk of plastic there was the fan relay, it was pop rivited to the inter-fender well, a quick drill of the pop rivits and a 4wire plug I had the fan relay in my hand. I paid the $75.00 bucks for the dealer part, (there is a aftermarket one) but I opted for the dealer part. The part came with 2 screws and 2 rivits I used the screws pluged it in and that was that. Replaced the headlight assembly, re-set the the check engine light and removed the high temp codes, I was done in about an hour and saved $400.00 in labor. When you cut the plastic I went right to the middle and made a hole so I could see the part and enlarged it so I could get my fingers and tools in. Jeep Part # 5017491-AB Relay PKG 8052328. I really hope this helps someone it is such a simple job, the worst part was the cutting of the plastic but start with a hole that you can see into and go to town. Bill