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Old 11-25-2012, 12:20 AM   #1
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Unhappy Temp Guage

I've got a problem with the temp guage on my 05 with the 2.4l engine. For some reason the temp guage is not working. It just sit at 100deg. I have changed the t-stat with no change. I have read other post saying there is a sensor that goes to the guage but I have not seen any post mentioning the 2.4l engine. The engine is not overheating and the heater seems to be working fine. Any suggestion or info would be greatly appreciated.

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Old 11-25-2012, 02:29 AM   #2
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I think it is at the front of the engine on the driver's side near where the top radiator hose goes to the engine. Should be near the t-stat. 2 wires to it, dark blue/dark green & violet/orange. It should have variable resistance accross the 2 terminals as the temp changes.

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Old 11-25-2012, 10:56 AM   #3
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Thanks for the reply. I thought that sensor sent the temp info to the computer to activate the fan and so on. Does it also work the guage? Maybe I should just change it and see if it makes a difference..
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Old 11-25-2012, 11:03 AM   #4
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In years past (such as on my 1989 Plymouth Voyager), Chrysler used two temp sensors: a 2-wire sensor at the thermostat to control the radiator fan, and a separate 1-wire sensor for the coolant temp gauge. If your 2.4L is still like this, the sensor mentioned above won't be the cause. Look carefully on the cylinder head for any 1-wire connections.
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Old 11-25-2012, 03:34 PM   #5
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I'm pretty sure there is only one sensor. It is connected to the PCM which then probably uses that signal for both functions.

I should have asked one more thing, does the gauge go down to the low end when the key is off or stay at 100 all the time?
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Old 11-25-2012, 07:58 PM   #6
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Well I did some testing. With the engine running I disconnected the harness to the coolant sensor and the guage moved up slightly, also the fan instantly comes on. Yes, when the key is off the guage moves down. I think your right it almost has to be the coolant sensor. I will get one tomorrow and relpace it and see what happens.

Thanks for the help and I will let you know how it goes.
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Old 11-26-2012, 09:47 PM   #7
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Well I replaced the sensor with no luck. I did make another discovery however. Through the course of checking and disassmebling I discovered that the instrumetn panel had been taken apart by the previous owner. I found that they had removed the cel. I think that while they did this they may have removed the need on the temp gauge thus making it read incorrectly. I ordered a new instrument cluster hoping this fixes my problem.
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Old 11-30-2012, 10:45 PM   #8
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Well I replaced the gauge cluster and my problem is fixed. It also fixed a smaller issue of the speedo reading 10mph faster than I was actually going.

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temp guage , temp sending unit

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