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Unread 04-17-2010, 08:37 PM   #1
Dano98
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Newbie with a question

I am new to the forum and jeep world. I just got a 1992 Jeep Wrangler YJ 2.5L. When i was driving home after picking it up all the guages worked good. The drive is about 45 min. About 15 minutes from my house the temperature started to rise i turned on the heat in the jeep and it keep going back in forth. By time I got home and parked the jeep the needle was right above 260. The jeep didn't overheat.

I have searched the forum and read over a couple of items to replace. I have replaced the thermostat and the temp sensor. when I start it up and it starts to get warm the temp guage automatically goes to about 250. I am not sure what to check next.

Thanks,
Dan

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Unread 04-17-2010, 08:51 PM   #2
little_Jeep
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Check the level and condition of your fluids.... any coolant loss? You said that temp gauge read high, but Jeep didn't over heat... I ssume you mean it didn't boil over? Did you feel hood to get an idea of how hot this Jeep got? Any other issues?
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Unread 04-17-2010, 09:50 PM   #3
Stryker777
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Did you verify your fan is working correctly?
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Unread 04-17-2010, 10:24 PM   #4
87YJBill
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make sure the radiator is not plugged, use an infared thermometer and check, also jeep has never been known for good consistent working gages.
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Unread 04-18-2010, 03:34 AM   #5
Dano98
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I have checked all the other fluids and everything is good. Correct it didn't boil over. I didn't feel the hood to see how hot it got. There are no othere issues.

The fan is working correctly. I stated before that it all was working fun for about 30 while i was driving then the guage started to read high.

The radiator is not clogged. It is a new radiator. I will get a infared thermometer and check the radiator.
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Unread 04-18-2010, 06:06 AM   #6
little_Jeep
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The first thing you need to determine is do you have an overheating issue, or just a faulty guage. Infrared will tell you this pretty quickly. I'm not a 2.5L guy, but when the radiator cap is removed (cold engine), can you see directly into the radiator to see the coolant? If yes, leave cap off, start engine and allow it to run until your thermostat opens...... watch for good coolant flow, you should be able to see movement in the coolant. If not, you may have a bad thermostat or the fins on the rear of the water pump maybe worn off. You stated that you just purchased this Jeep... then you stated it has a new radiator, this makes me wonder if prior owner wasn't having this issue and just never found the cause, or didn't like the cause he found.
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Unread 04-19-2010, 02:27 AM   #7
Dano98
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I changes the thermostat and temp sensor. I started the jeep and within 5 minutes the temp guage was already reading 260. I let it idle for about 20 minutes then i took it for a 10 minute drive didn't not boil over and no steam like it was over heating. I have come to the conclusion that the guage is broken.
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Unread 04-19-2010, 03:23 AM   #8
Mark05059
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how did you come to this conclusion with out finding out the actual temperature of the cooling system?
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Unread 04-19-2010, 05:02 AM   #9
asbury
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there is a temp sensor and a temp switch on the 2.5s temp switch controls the gauge and is located on the cyl head drivers side back be side valve cover temp sensor is on thermostat housing
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Unread 04-19-2010, 05:04 AM   #10
MJMPC
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Where was the temp sensor you changed?
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Unread 04-19-2010, 09:36 AM   #11
kennemore_m
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If you really think your temp gauge is not working, try attaching an after market one. You can buy them Harbor Freight for about $10 and they are very easy to install. That would let you know for sure if it is a gauge problem.
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Unread 04-23-2010, 07:16 AM   #12
CrawlingForward
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How fast do changes in the needle happen? Does it gradually and evenly move up over the 5 minutes, or does it seem to all of a sudden accelerate?

Also, does it keep normal behavior when you turn the car off?
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