2008 XC70 Coolant Leak
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    1. #1
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      Arrow 2008 XC70 Coolant Leak

      I am not so familiar with the XC70 but this one me stumped with a coolant leak that i cannot find. Cool bottle goes low, to the min line, after about 200 miles of driving. I cannot find the leak. Any ideas where to look? Danke.

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    3. #2
      Проверьте уровень масло в моторе (прокладка головы) и сам выхлоп не сладкий Check the oil level in the engine (head gasket) and the exhaust itself is not sweet

    4. #3
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      Quote Originally Posted by Aleksejs Jakovlevs View Post
      Проверьте уровень масло в моторе (прокладка головы) и сам выхлоп не сладкий Check the oil level in the engine (head gasket) and the exhaust itself is not sweet
      Exhaust should be Salty not Sweet?


      -powered by 5 mad vikings-
      XC70|D5|AWD|GT6|MY11|Polestar|IPD SWAY|

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    6. #4
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      Thanks. I will check oil and exhaust for coolant evidence.

    7. #5
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      I've seen more than a few cars which would loose a certain amount of coolant without having the level drop dangerously. Perhaps you need a new cap. I'm surprised no one has suggested a pressure test...

      https://www.google.com/search?q=cool...hrome&ie=UTF-8
      Last edited by halfast3; 06-27-2020 at 09:22 AM.
      2016 XC70 2.5L T5 AWD, Platinum, Seashell/black, ipd rear bar, Curt hitch and wiring
      Previous Volvos: '16 V60CC, ours; 7? 245DL & '6? 145DL, hers; '68 122S Wagon, his.
      Non-Volvos previously owned: waaay too many to list here.

    8. #6
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      Cap was good. First thing I checked. Not having much time dealing with P3s I have been learning my way about this vehicle. I have found the leak. It was the connection one the intake manifold side of the hard plastic bleed line running from the coolant bottle to the head. The line only has coolant in it when engine running since it sits high in the cooling system. Since it is right on top of the Head, it does leave much coolant to see as a leak. Line is on order.

    9. #7
      Member beachnut's Avatar
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      So what was the evidence that lead you to that hard line? I've wondered about that line myself, seems fragile. Recently the light came on in the S80 T6, down to the min mark, refilled and also replaced the cap, but I'm a firm believer that coolant doesn't just evaporate into the atmosphere. There's always a leak no matter how minute, inside or out.
      2015.5 XC60 T6 Flamenco Red/Sand, Platinum, Tech, Blis - wifemobile
      2010 S80 T6 Silver/Anthracite, Dynaudio/Nav, Climate, Blis - my dd
      2005 S40 T5 Passion Red/Quartz, Dynamic Package, E46 bixenon retro - garage queen
      2005 S60 2.5T Black/Graphite, Premium, Sport, Climate - son
      Previous: '05 S60 T5, '04 S80 2.5T, '98 V70 T5, '96 854 Platinum

    10. #8
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      I took parts cleaner and wiped the coolant bottle clean about the 2 small lines, the cap area, the over flow area, and cleaned the area on the opposite end of the lines, cooler lines, and radiator sides. Where I cleaned the bleed line in area on the front of intake And below, the next morning I saw some drops on the intake. Tiny but there. Took white napkin to touch the drops and it came up blue. Looking thru the quick connect fitting I could see it was wet. Napkin test showed blue. I pull the quick connect to find coolant outside the seal and some calcium type buildup on the metal nipple. I will clean up nipple and put the new line on when it comes in. Hope this helps clears things up.

    11. #9
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      Thermostat is poorly designed on these vehicles. The plastic housing fails internally and the thermostat spring pushes the housing away from the engine block causing leaks. Mine failed about two years ago. Also check the upper radiator hose that connects to the thermostat, the sealing o-ring can harden over time.

      You can check for leaks with a good flashlight and mirror.




    12. #10
      Member CrossingCountries's Avatar
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      Thank you so much for feedback. It helps us preserve our cars for a longer time. All this info is awesome. We all are specialized in something. 1+1=3


      -powered by 5 mad vikings-
      XC70|D5|AWD|GT6|MY11|Polestar|IPD SWAY|

    13. #11
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      Slowtype - thanks! This is the type of things that are good to know about the 3.2 engine. Volvo has at times not done so well with plastic parts over the years. My 960 had a plastic oil pressure relief valve that failed from cycling against the stop. 104k mile no oil pressure. The replacement was metal one. Same thing happened to my sister on the 850. In the family I have replaced 3 coolant tanks and 3 thermostat plastic housings. Now I consider these scheduled maintenance items. I don’t like the plastic thermostat housing but I am not smart enough to make one out of aluminum. Anywho, thanks again.

    14. #12
      Member beachnut's Avatar
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      Interesting. Of course my S80 has a plastic t-stat housing, why wouldn't it I'll have to check it out. I'm still kicking myself on the S40 that I didn't replace it when I was replacing the pita octo-hose.
      2015.5 XC60 T6 Flamenco Red/Sand, Platinum, Tech, Blis - wifemobile
      2010 S80 T6 Silver/Anthracite, Dynaudio/Nav, Climate, Blis - my dd
      2005 S40 T5 Passion Red/Quartz, Dynamic Package, E46 bixenon retro - garage queen
      2005 S60 2.5T Black/Graphite, Premium, Sport, Climate - son
      Previous: '05 S60 T5, '04 S80 2.5T, '98 V70 T5, '96 854 Platinum

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