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2003 Forester Automatic
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30 Posts
Discussion Starter · #1 ·
I have a 2002 Forester that is still overheating
Replaced
thermostat//water pump//radiator//timing belt

Started car and still overheats....not sure why
any thoughts??

Thanks
 

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2012 Forester X 5 MT
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881 Posts
Maybe it's not overheating and the temp sensor is bad?

Under what conditions does it overheat? Idling? Traffic? Highway? Does it boil over?
 

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2003 Forester Automatic
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30 Posts
Discussion Starter · #3 ·
I have replaced the ECT sensor
it is overheating when idling. I start the car and let it ran for 20 minutes and it slowly heated up
not sure what else to replace
 

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2003 Forester Automatic
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30 Posts
Discussion Starter · #5 ·
I replaced the ECT sensor
it shows that it is getting hot while idling
I do not see any smoke
it just shows its heating up
 

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2011 2.5x Auto
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346 Posts
Overheating in the winter?

I read somewhere that the boxer engines will overheat if the heater core is completely plugged up. Apparently, the heater water opens the thermostat.
 

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2014 2.5i Touring CVT
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239 Posts
I read somewhere that the boxer engines will overheat if the heater core is completely plugged up. Apparently, the heater water opens the thermostat.
I agree, my first suspicion was a blocked heater core. I suggested the rad cap as well, hoping for a simple fix.
 

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2017 Subaru Forester XT CVT
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10 Posts
My boy had the same problem on a 98 Imprezza 2.5. Random overheating ,temps to 240. Turned out to be head gaskets.
 

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Premium Member
2019 Crosstrek 2018 XT
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14,698 Posts
My boy had the same problem on a 98 Imprezza 2.5. Random overheating ,temps to 240. Turned out to be head gaskets.
Yea..always consider HG's when a Subaru overheats.
 

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1999 L 4AT
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1,215 Posts
Is there a way to test if it is the Heater core? Are they simple to replace?
Yes, see if there is plenty of heat in the passenger cabin area ... crank the heater!!!! ... If there is little heat, your heater core MIGHT be clogged.

On a different note, is your Check Engine Light on, and are your fans turning on when the engine overheats?
 

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Premium Member
2019 Crosstrek 2018 XT
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14,698 Posts
Heater cores are not simple to replace. Far, from it.
 

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1999 L 4AT
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