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Heater Runs Hot At First Then Lukewarm?


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12 replies to this topic

#1 roadsubiedog

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Posted 08 September 2012 - 02:28 PM

Heater works fine for awhile and then blows lukewarm. also temp gauge is slightly hot. put in a new thermostat and new waterpump.

#2 Prwa101

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Posted 08 September 2012 - 02:57 PM

What kind of Subaru is this? Could be the radiator, over time it will fill with crud and restrict the flow to the rest of the car like the heater core, also making it heat up.

Is it still running warm with the new thurmo and water pump?

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#3 mikaleda

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Posted 08 September 2012 - 03:32 PM

Sounds like a clogged heater core to me you can back flush your heater core by reversing your heater lines and running youre engIne than switch it back. When your done you probably want to flush your system to keep it from clogging up again

#4 suberdave

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Posted 08 September 2012 - 04:16 PM

my EA82 Wagon did the exact same thing. the heater core was clogged. i tryed back flushing it many times. did not work.

had to replace the heater core. now it has been working awesome for the last 6 years or so.

sorry for the bad news...

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#5 2.5LOYALE

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Posted 09 September 2012 - 12:06 AM

replaced my core.....worx great....

would do the same:popcorn:

#6 Durania

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Posted 09 September 2012 - 10:24 AM

I had luck replacing a faulty radiator cap after flushing heater core. Used a tappered fitting used to repair a garden hose. Fits right in a heater core line.

#7 ivans imports

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Posted 09 September 2012 - 10:48 AM

heater core take 1 hour pull the whole dash out drop cullom and pullout whole heater box as unit watch for cracks were the lines go into core have had good luck with geting a rad shop to recondition cores is fairly cheap

#8 jonas

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Posted 09 September 2012 - 05:46 PM

Ya, flushed mine several times, no dice. Really not looking forward to replacing core, but getting tired of freezing.

#9 roadsubiedog

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Posted 16 September 2012 - 10:11 PM

switched the heater hoses and now the heater blows real hot like it should. the temp is still running 190-195 though. may have to get a new radiator.

how long should I flush the heater core?

#10 Durania

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Posted 16 September 2012 - 10:16 PM

When you see water coming out of the other hose and not coolant. I will do about 2 or 3 minutes per hose.

#11 roadsubiedog

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Posted 23 September 2012 - 04:14 PM

When you see water coming out of the other hose and not coolant. I will do about 2 or 3 minutes per hose.



thanks. after flushing heater core the heater blows hot now. still runs hot though. i'd like to know where to find a reman radiator or how can i see if it is a blown head gasket. this is a 84 gl.

#12 Durania

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Posted 23 September 2012 - 09:20 PM

thanks. after flushing heater core the heater blows hot now. still runs hot though. i'd like to know where to find a reman radiator or how can i see if it is a blown head gasket. this is a 84 gl.


Did you do the radiator cap?

#13 roadsubiedog

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Posted 25 September 2012 - 08:54 PM

Did you do the radiator cap?



yes. new cap. thermostat and waterpump. it takes about 10 minutes to start overheating after getting to 180 degrees. and yes the fan comes on when it is supposed to.

this weekend i am gonna switch out radiators with my good daily driver 84 gl. this should tell me something.




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