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Engine overheat help

Discussion in 'Everything Else (off topic)' started by Well Seasoned, Dec 3, 2021.

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  1. Well Seasoned

    Well Seasoned Administrator

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    My 09 Subaru outback suddenly overheated along with the heater not working in the car. I immediately thought thermostat, so i replaced that along with burping the system. It seemed this helped, but when i test drive it, while going down a hill, the heater stopped working again until i turned around and went back up the hill. I drive a little further, then the engine overheated again with my heater not working.

    I feel i burped the system enough. There's a chance the thermostat was crap out of the box and i should have tested it before i installed it, but i didn't.

    Going with the cheapest things first, I'll replace the radiator cap next, although it looks good, you never know. Another thing i can think of (and hopefully it's not) is the head gasket, but I'm not seeing any mayonnaise looking film on the radiator cap,the overflow tank or engine oil dipstick. Maybe a bad water pump.......????

    Any mechanics have any thoughts? Thanks!
     
    Well Seasoned, Dec 3, 2021
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  2. Horkn

    Horkn

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    How's the crankcase oil looking?
     
    Horkn, Dec 3, 2021
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  3. Canadian border VT

    Canadian border VT

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    Water pump or the pulley on serpentine belt..
    how many miles and when was major service done?
     
    Canadian border VT, Dec 3, 2021
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  4. Canadian border VT

    Canadian border VT

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    Quickest way to rule out head gasket.. is there oil in antifreeze
     
    Canadian border VT, Dec 3, 2021
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  5. Well Seasoned

    Well Seasoned Administrator

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    Looks good, no seperating fluids as far as i can tell.

    Belt is turning, so unless the shaft broke inside, I'd figure the pump is turning......
    Major service as in timing belt and water pump, not yet

    Like i mentioned in the first post, not seeing that mayonaise junk on any caps.....
     
    Well Seasoned, Dec 3, 2021
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  6. Well Seasoned

    Well Seasoned Administrator

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    Oh.... 112k
     
    Well Seasoned, Dec 3, 2021
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  7. Horkn

    Horkn

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    It can go the other way too though. Antifreeze in the crankcase. Depends where the head gasket fails. Hopefully it's"just" a water pump or less. Any puddles anywhere?
     
    Horkn, Dec 3, 2021
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  8. Horkn

    Horkn

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    I don't own, or haven't owned a Subaru, but that's pretty normal time for a water pump to be replaced
     
    Horkn, Dec 3, 2021
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  9. Creekin

    Creekin

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    Fans working?
     
    Creekin, Dec 3, 2021
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  10. Well Seasoned

    Well Seasoned Administrator

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    Not seeing any different fluids in the oil, normal exhaust for the outside temps, no extra "fog" coming from the exhaust
     
    Well Seasoned, Dec 3, 2021
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  11. Canadian border VT

    Canadian border VT

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    Get a long handle screw driver and listen too water pump with engine at idle.. just because belts moving if impeller on inside gone not moving enough fluid through heater core
     
    Canadian border VT, Dec 3, 2021
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  12. TurboDiesel

    TurboDiesel

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    Ugh. Subaru's are pretty famous for blown head gaskets.
     
    TurboDiesel, Dec 3, 2021
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  13. Well Seasoned

    Well Seasoned Administrator

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    Yes, both kick on, running smooth, when they should......
     
    Well Seasoned, Dec 3, 2021
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  14. Canadian border VT

    Canadian border VT

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    Yeah but how is they don’t replace timing belt, water pump, pulleys and belt

    Horkn they are 22% of vehicles on road in my state so you get to know them
     
    Canadian border VT, Dec 3, 2021
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  15. Well Seasoned

    Well Seasoned Administrator

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    Ill give that a listen tomorrow.....,
     
    Well Seasoned, Dec 3, 2021
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  16. Creekin

    Creekin

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    I've had head gaskets where all it will do is leak just enough combustion pressure to over- pressurize the cooling system and push coolant out
    With newer multi layer steel gadkets they seem to no always act like the old fiber ones
     
    Creekin, Dec 3, 2021
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  17. Well Seasoned

    Well Seasoned Administrator

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    I know, but Im not seeing any evidence of that, but could be
    Im just trying to go cheapest fix first... If i have that work done, ill have them do all that
     
    Well Seasoned, Dec 3, 2021
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  18. TurboDiesel

    TurboDiesel

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    I think my cummins is doing that.
    Lots of gurgling when i shut it off.
    Intermittent heat last week. Still full of water.
     
    TurboDiesel, Dec 3, 2021
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  19. Well Seasoned

    Well Seasoned Administrator

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    I wont bother with a head gasket. Can only imagine the cost and that probably wouldnt be worth it
     
    Well Seasoned, Dec 3, 2021
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  20. Well Seasoned

    Well Seasoned Administrator

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    Check that radiator cap first, oe only
     
    Well Seasoned, Dec 3, 2021
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