OBD Fusion showing high temperature, but dashboard temperature is normal.

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My 1998 Subaru Legacy L with 97,000 miles on it is running smoothly. But towards the end of today's driving (120 miles, mostly highway) I noticed that the temperature gauge on OBD Fusion was climbing high, over 200 (220o is the beginning of the red zone). The temperature gauge on the dashboard was normal. I know that the dashboard reads a sensor on the radiator. Does the engine diagnostic port use the same gauge? I am driving around 500 miles on Tuesday and will call my mechanic tomorrow morning. I am trying to figure out how concerned to be about this problem.
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Paul Chernoff

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Posted 2 years ago

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Paul Chernoff

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I talked with my brother-in-law (knows much more about cars than me) and my mechanic. It should be safe on the Interstates tomorrow. That I probably need a new thermostat or sensor in the engine. But as long as the car's dashboard temp gauge shows OK I shouldn't worry. That gauge was replaced 3 months ago so I am confident it is OK.

I did check oil and coolant levels yesterday and they were exactly where they should be. The coolant is fine, it was replaced 3 months ago when my radiator was replaced.

Of course other opinions are welcome.
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Jeff, Alum

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Hey Paul,

Thanks again for reaching out!

In cases like this, we definitely recommend consulting with a mechanic as you did here. While we don't have anything more to add to this topic, I'll leave it open for others to discuss in case they have anything to share.

Thanks :)
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Paul Chernoff

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My brother in law things that it is the thermostat, that something isn't opening as much as it should so not as much coolant is flowing. But as long as the dashboard temp is normal I should be OK, especially on the Interstates.

A master mechanic friend seconded that but also suggested that the head gasket could be leaking gas that is mixing with the coolant.

Wed I go to my mechanic.
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Allen

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If you are stop the temp will go up if you are driving they will go down due to air web you stop your car is not getting a lot of air. Like it does when you are driving that why they put Radiator fan on cars for.
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Allen

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If your car hits 230 then stop because it's starting to over heat at 260 it done blown a head gasket
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Paul Chernoff

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Thanks. Highest I have seen so far is 206. Usually in low 190s
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Allen

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Your welcome. You car is running as it was built to just make sure you don't hit 230 Fahrenheit. Let me know if there is anything else I can do for you.
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Amy

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Thanks for helping out a fellow community member, Allen!

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