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Coolant leak V70 V70-XC70 1999

posted by  Oleseahorse on  Thu Oct 11 17:45 CST 2012
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last visit: Fri Oct 24 11:45 CST 2014
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Hello All,

Between bouts working on my 240, I've been trying to solve a coolant leak that just has me stymied. The car has 145K.

Although I just changed my coolant and swapped out the thermostat, I've now changed out the thermostat gasket three times, this last time with a 'shmear' of RTV. Since I had just removed the thermostat housing it was only logical that I must have done a poor job on the thermostat housing, or there was a nick or some problem with the housing. Not so, as it turns out because I've pressurized the system, sprayed soapy water around that housing as well as used crumpled up paper towels under the thermostat housing and there are no leaks there. I'm also certain that none of the hoses or hose connections are leaking and the radiator, although original is fine.

With it so "busy" from above as well as below, hampering any good view, I still can't figure out where the leak is. The drips always end up on the underside of the oil filter. I don't think the coolant sensor is leaking (too far away) but I wonder if the HEPU water pump I installed in 07 (when I changed the T-belt) when the car had 105K is leaking. Although I did the job, I don't recall much. Should I peel back the wheel-well flap? Will I be able to view the pump without removing the belt?

Any thoughts you might have as to how to proceed would be appreciated.

Marty Wolfson








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    Coolant leak V70 V70-XC70 1999

    posted by  Oleseahorse on  Wed Oct 31 06:58 CST 2012
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    last visit: Fri Oct 24 11:45 CST 2014
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    Just a followup if anyone has been reading my post. As it turned out, the goofy radio talk show auto expert was wrong. There is no paper gasket below the thermostat housing. So it definitely wasn't leaking there.

    Secondly, it was the HEPU pump that failed with 40K and 5 years. If I had to do it again, as Klaus recommended I would not have replaced the pump when I did the timing belt at 105K and secondly, if I did, I would have used a Volvo pump, be it made in China or Germany or wherever.

    Marty Wolfson







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    Coolant leak V70 V70-XC70 1999

    posted by  Oleseahorse on  Fri Oct 26 18:36 CST 2012
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    last visit: Fri Oct 24 11:45 CST 2014
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    Update:

    If you've followed this post, you know I've checked everywhere and came to the conclusion that my HEPU aftermarket pump failed. Maybe not.

    I replaced the pump last night (and the serpentine belt) and think I may still have the same leak. I'm getting concerned. I haven't looked at it since I found the puddle under the car.

    I will run it tomorrow and try to get another look see. There's nothing else to replace. When I installed the pump, all the old gasket was removed and the new gasket was easy to apply (I use grease on both sides) because the pump and gasket have the two locating dowels.

    I'm just frustrated and stymied, and I hate to bring it to a shop. Any additional suggestions would be welcome.

    Thanks,

    Marty








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      Coolant leak V70 V70-XC70 1999

      posted by  Oleseahorse on  Sat Oct 27 07:38 CST 2012
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      last visit: Fri Oct 24 11:45 CST 2014
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      Hate replyiing to my own message, but the radio talk guy here in Albany suggested that the paper gasket below? the thermostat housing is leaking and needs to be replaced. He indicated that this occurs when the upper thermostat housing is removed. He commented that some "bracketing" needs to be removed to access that lower housing.

      I've not heard of this. Could anyone comment further.

      Help!!

      Marty








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    Coolant leak V70 V70-XC70 1999

    posted by  someone claiming to be klausc on  Thu Oct 18 14:24 CST 2012 [RELATED]

    Pulling off the Tbelt cover will let you see the pump area, and yes, the coolant will drip down to the oil filter from there.








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      Coolant leak V70 V70-XC70 1999

      posted by  Oleseahorse on  Sun Oct 21 16:54 CST 2012
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      last visit: Fri Oct 24 11:45 CST 2014
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      Hi Klaus,

      Yup, I pulled the timing cover off and there's a stalagtite growing from the underside of the pump. It's kind of bothersome cause I replaced the original pump at 105K with a HEPU unit and now some 5 years later with 45K more miles, the pump has failed.

      I've used the HEPU pumps on my 240 and never had an issue. I hate doing the same job twice. What's more upsetting is my mechanic yelled at me for replacing the original Volvo pump, commenting that they typically last til 210K, the second t-belt change.

      Oh well, the parts arrived yesterday so sometime this week, I'll put my mechanic's hat back on.

      Thanks for the post.

      Marty








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        Coolant leak V70 V70-XC70 1999

        posted by  KlausC on  Wed Oct 24 14:16 CST 2012
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        last visit: Fri Oct 24 10:15 CST 2014
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        I have to agree with your mechanic, these pumps are usually good for over 200K so long as you use and flush with good antifreeze. This aluminum block is not a 240 red block and runs slightly warmer. Always use OEM pumps; anything that lasts 200K is worth the cost.
        --
        My name is Klaus and I am a V♂lv♂holic








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          Coolant leak V70 V70-XC70 1999

          posted by  Oleseahorse on  Wed Oct 24 18:03 CST 2012
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          last visit: Fri Oct 24 11:45 CST 2014
          [RELATED]

          Uh oh,

          already purchased a new HEPU. Hope this one lasts longer than the first. Had I known that you were going on vacation, I would have delayed, at least, all my parts ordering. Wisdom comes only from making mistakes. Unfortunately, oftentimes, I have to make the same mistake twice to learn a lesson.

          If there is a next time, for sure, an original Volvo pump will be on my parts list. C'est la vie.
          Now to install the pump without screwing up is my next battle.

          Thanks Klaus,

          Marty







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