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Discussion Starter · #1 ·
Hi everyone, my name is Vhic and i'm new here. I just have a question. This is my first time to own a Subaru (2009 Forester, non-turbo, with 228T km already) and I just noticed (I will have to observe again) that the Temperature blue light is always on. What's the best thing to do? Thank you so much!
 

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2019 Touring
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242 Posts
Mine comes on for a very short time as my radiator/engine heats up to operating temperature. It then goes off.
 

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2019 Forester Base CVT
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310 Posts
I had a Nissan about 20 years ago that always stayed on hot. Here's what I found:

The electrical connector to the temp sensor (usually near the thermostat) was corroded. With Nissan, no voltage passing reads "Hot". Perhaps with Subaru, no voltage reads "Cold". Take off the connector and clean it with sandpaper and contact cleaner and see if that makes a difference. Clean both the male and female connectors. Only takes a few minutes.

Hope this helps.


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2020 Forester Touring CVT7
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270 Posts
Hi everyone, my name is Vhic and i'm new here. I just have a question. This is my first time to own a Subaru (2009 Forester, non-turbo, with 228T km already) and I just noticed (I will have to observe again) that the Temperature blue light is always on. What's the best thing to do? Thank you so much!
if blue light is always on .. take it in for repair
it normally to turns off ~100-120F or 40-50C engine temperature
 

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Sahuarita, AZ 2018 Forester Limited
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2,815 Posts
The first thing I would check is the thermostat which might be stuck open and preventing the engine from reaching normal operating temperature.
 

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2018 Forester CVT
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177 Posts
I know on one my previous cars the thermostat was stuck open you’ll get lousy gas mileage because the engine never got to optimum operating temp.
Lou Cioccio
 

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Super Duper Admin Guy
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2,890 Posts
Welcome to the forums @vhic.delaserna and great first question/post...

I totally concurr with Post #3 by @RidingWV. Check the sensor as they are not "life of vehicle" units.

And...

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2016 Forester XT Touring
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943 Posts
IIRC, the blue light turns off when the temp is 122*. My coolant temp was one of the displays on my accessport on my 2010 XT.
 
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