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Old 03-09-2019, 01:28 AM   #1
Mharshaw
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Member#: 498783
Join Date: Mar 2019
Default Temp gauge running hot

Hello world, I have a 2000 Subaru Impreza Outback Sport and the temp gauge reads hot automatically even on a cold start, we replaced both the oil temp sensor and cooling sensor and the thermostat and even replaced the radiator cap, she is not overheating and even burped the system, answers would be greatly appreciated to get the root of the problem, thank you
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Old 03-10-2019, 04:52 PM   #2
caimstear
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Join Date: Mar 2019
Default

Have you read the computer to see if it's pulling a code?
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Old 03-11-2019, 02:31 AM   #3
Mharshaw
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Default

Yes we did and there’s no code
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Old 09-16-2020, 07:08 PM   #4
Johnny Subaru
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Member#: 518635
Join Date: Sep 2020
Default Same issue in my '95 Legacy

The gauge stays in the middle when the car is on.

Even when only the ignition is on, it goes to the middle. Then back down when the car is off.

Goes straight to the middle on a cold start, and stays there when warm and never moves (until I turn off the engine).

I unplugged the coolant temp sensor (CTS) and turned on the ignition (not the engine) and the gauge went to the middle again. This also kicked on the cooling fans.

Then I unplugged the temp sender unit (right next to the CTS) and the gauge still went to the middle again when I turned on the ignition.

No codes.

Haven't figured out the issue yet
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Old 09-17-2020, 07:27 AM   #5
Cujo31
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Member#: 19843
Join Date: Jun 2002
Chapter/Region: MWSOC
Location: St. Louis
Vehicle:
2000 2.5 RS Sedan
2016 Base 5MT VRP

Default

perhaps just a short in the gauge cluster? I suppose you'd have to get your hands on another gauge cluster from a junkyard and plug it in and see if the gauge behaves the same way?
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Old 09-26-2020, 03:32 PM   #6
Johnny Subaru
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Default Solved

Solved: the gauge was bad.

I replaced the single wire sending unit, this was not the issue for me.

No need to buy a whole cluster, just pull the temp gauge off your cluster, then pull another from your local wreckers. Cost me $10
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