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Oil in Coolant Reservoir, but no Coolant in Oil and humming noise at Startup S70 1998

posted by  740madness on  Sat Sep 22 15:43 CST 2012
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last visit: Sun Jun 29 21:07 CST 2014
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Ok, so two things (1998 s70 glt):

1.) There is oil in my coolant reservoir even after a coolant flush, but none in my oil. Bad radiator? I heard Prestone stop leak might do the trick. The car runs smooth, and it is only in my reservoir.

2.) Also, at startup there is a humming sound from the front driver's side of the engine, bad SAS pump?








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    Oil in Coolant Reservoir, but no Coolant in Oil and humming noise at Startup S70 1998

    posted by  Chris Mullet on  Sun Sep 23 12:48 CST 2012
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    last visit: Fri Oct 24 09:08 CST 2014
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    Check the transmission fluid for signs of coolant mixing into it. In the case of a failed radiator, it's coolant and ATF that will mix, not coolant and engine oil.








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    Oil in Coolant Reservoir, but no Coolant in Oil and humming noise at Startup S70 1998

    posted by  KlausC on  Sat Sep 22 21:51 CST 2012
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    last visit: Fri Oct 24 10:15 CST 2014
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    #2 The humming noise should be the Idle Air Control motor which is on if the key is in posII. The SAS air pump is under the battery and will run for the first minute or so until the CAT warms up.

    #1 This could be a bad radiator or a leaky headgasket (blowing exhaust into your antifreeze?) Usually, a bad radiator will allow the antifreeze to mix with the oil after the engine shuts down and the pressure is the highest.

    Do yourself a favor and have the oil tested for antifreeze. There are strip test kits at the autoparts store.

    Do not use stop leak.
    --
    My name is Klaus and I am a V♂lv♂holic








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      Oil in Coolant Reservoir, but no Coolant in Oil and humming noise at Startup S70 1998

      posted by  Tapsa on  Sun Sep 23 01:24 CST 2012
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      last visit: Sun Oct 19 13:29 CST 2014
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      Hi, some newer volvos have Behr oil cooler at the back of oil pan and it is one of potential mixing points.
      br Tapsa







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