Temperature increases when I reach highway speeds.
#1
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Year: 1995
Model: Cherokee
Engine: 4.0 Litre AMC 242
Temperature increases when I reach highway speeds.
Hi Guys,
I have a problem with my 1995 Jeep Cherokee XJ has a 4.0 engine and an automatic transmission.
The problem arises when accelerating, the temperature begins to increase, ie, when I'm driving on the freeway and accelerated steadily to reach speeds between 60-85 MPH, the needle on the temperature starts to rise from normal (the line before 210 degrees, up to the line that follows the 210). This seems very strange since earlier when driving on the highway the temperature tended to decrease. Two days ago I had to make a trip of about 200 miles and it was a nightmare, I could not pass 60MPH because the temperature began to rise.
Both fans (Electrical and Mechanical) work well, the temperature sensor is relatively new (4 months). 5 months ago I would service the radiator and water pump change in February this year.
I would appreciate any help you can give me about it.
Thanks in advance.
I have a problem with my 1995 Jeep Cherokee XJ has a 4.0 engine and an automatic transmission.
The problem arises when accelerating, the temperature begins to increase, ie, when I'm driving on the freeway and accelerated steadily to reach speeds between 60-85 MPH, the needle on the temperature starts to rise from normal (the line before 210 degrees, up to the line that follows the 210). This seems very strange since earlier when driving on the highway the temperature tended to decrease. Two days ago I had to make a trip of about 200 miles and it was a nightmare, I could not pass 60MPH because the temperature began to rise.
Both fans (Electrical and Mechanical) work well, the temperature sensor is relatively new (4 months). 5 months ago I would service the radiator and water pump change in February this year.
I would appreciate any help you can give me about it.
Thanks in advance.
#2
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Assuming your WP is working: how old is your thermostat?
I'd look at radiator (also cleaned outside from bugs etc, after summer?), thermostat, radiator cap next.
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Year: 1995
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The radiator seems to be clean, but tomorrow I will clean it and at first glance does not seem to insects or other dirty, but it's always good to make sure.
#4
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Thanks for responding, sorry for my English, I meant that the service had already done the radiator. I changed the thermostat too along with the water pump. The radiator cap is the original 16psi should change it?
The radiator seems to be clean, but tomorrow I will clean it and at first glance does not seem to insects or other dirty, but it's always good to make sure.
The radiator seems to be clean, but tomorrow I will clean it and at first glance does not seem to insects or other dirty, but it's always good to make sure.
Your thermostat: you replaced it with a 195 F stat? Tested it before putting it in? I found my Gates thermostat didnt even open half as much as the OEM one I eventually got from the dealer (the one with the little hole in it). Temp has been very stable since I put the OEM stat in.
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Year: 1995
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All cooling system parts play together in keeping your engine at operating temp under different circumstances. So, every sub-par item will add to the end result. The radiator cap is actually a maintenance item, and if its the original, is might by now have well lost it's full 'sealing' capacity. Loosing pressure = decreasing boiling point > running warmer under normal circumstances. It's a cheap item, replace it.
Your thermostat: you replaced it with a 195 F stat? Tested it before putting it in? I found my Gates thermostat didnt even open half as much as the OEM one I eventually got from the dealer (the one with the little hole in it). Temp has been very stable since I put the OEM stat in.
Your thermostat: you replaced it with a 195 F stat? Tested it before putting it in? I found my Gates thermostat didnt even open half as much as the OEM one I eventually got from the dealer (the one with the little hole in it). Temp has been very stable since I put the OEM stat in.
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All bits could add up... see how you go.
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Year: 1998
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The t-stat is the only cooling system component that can easily be tested (no special tools). Got a stove, a small pot u can fill with water and place the stat in and a cooking thermometer? Don't toss the stat into boiling water. Put both stats in the pot of water and compare them to each other. They should just barely begin to open at their temp rating, continue to open slowly/smoothly and wide open should be about 1/4".
Last edited by djb383; 09-23-2014 at 09:32 PM.
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Year: 1995
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OK, seeing it from that point of view, it makes sense that both recommend me, today I'm going to do things as follows:
I'll go to a garage that specializes in radiators and I will make sure to do the internal radiator flush as recommended djb383. Once this is done, I will proceed to do a test on the highway, if the temperature continues to rise, then I'll buy a radiator cap and new thermostat.
I know it would be easier to start with replacing the two pieces, but I have a sneaking suspicion that the radiator flush that did not follow the procedure previously described by djb383, so I decided to start with this alternative.
Thanks again for your help and I will be leaving you my feedback once I've done the tests at the end of the day.
I'll go to a garage that specializes in radiators and I will make sure to do the internal radiator flush as recommended djb383. Once this is done, I will proceed to do a test on the highway, if the temperature continues to rise, then I'll buy a radiator cap and new thermostat.
I know it would be easier to start with replacing the two pieces, but I have a sneaking suspicion that the radiator flush that did not follow the procedure previously described by djb383, so I decided to start with this alternative.
Thanks again for your help and I will be leaving you my feedback once I've done the tests at the end of the day.
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Year: 1998
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A radiator "flush" is virtually worthless and I doubt u'll find a reputable rad shop that says they can "flush" a radiator out and guarantee all of the tubes r 100% unplugged. A reputable rad shop will disassemble the rad (separate the tanks from the core) and insert a rod into each tube, thus clearing/knocking out any scale/solid obstruction that's inside each tube. It's called "rodding out" the rad, not flushing the rad. +/-$110 buys a new rad so get an estimate on how much to "rod out" a rad 1st.
#12
A radiator "flush" is virtually worthless and I doubt u'll find a reputable rad shop that says they can "flush" a radiator out and guarantee all of the tubes r 100% unplugged. A reputable rad shop will disassemble the rad (separate the tanks from the core) and insert a rod into each tube, thus clearing/knocking out any scale/solid obstruction that's inside each tube. It's called "rodding out" the rad, not flushing the rad. +/-$110 buys a new rad so get an estimate on how much to "rod out" a rad 1st.
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Can radiators with plastic tanks be rodded out?
If it's it's possible, I would think it would cost more than a new radiator.
If it's it's possible, I would think it would cost more than a new radiator.
#14
Temperature increases when I reach highway speeds.
Mine does the same thing . '98 XJ , 40,000 miles , new 3 core radiator , high flow water pump , high flow thermostat & housing , triple threat fans ( 3 electric fans with shrouds ) 2/3 distilled water & 1/3 antifreeze with Red Line Water Wetter added . No head gasket problems & uses no oil - WTF ???