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Pressurized Coolant Coming out of Overflow Tube 120-130

posted by  122_Canadian on  Wed Mar 26 13:06 CST 2008
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last visit: Tue Oct 20 07:51 CST 2009
[RELATED]

Hello All,

I just got my 240 rear end bolted up over the long weekend and needed to take my car into work after having it sit in the garage for the past 4 months while I finished the conversion. As my car was not tuned for the current weather (still not past 10 degrees C) I decided give the carbs a couple of flats and make sure the needle was centered.

So after fiddling around with the carbs for 10-15 minutes (right after a 10 minute drive from work) - I got the jet centered and the mixture set and then, just as I was about to shut it off, I get coolant steaming out of the overflow tube under pressure.

I shut it off and went for a read of my Haynes. According to them, this is an indication of a blown head gasket...Is there something else that would force steaming coolant out of the overflow tube? I wish I could tell you if it had overheated, but my temp gauge quit working some time ago. I've got an electric fan with a thermo switch mounted in the coolant distribution tube (on at 185 F off at 175 F) - it didn't come on.

Could this be just a stuck thermostat?

Craig

P.S. Good thing I've got a B20 on the bench in case the head gasket truly went.








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    Pressurized Coolant Coming out of Overflow Tube 120-130

    posted by  Ron Kwas on  Wed Mar 26 13:51 CST 2008
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    last visit: Fri Oct 24 04:03 CST 2014
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    Craig;

    "Pressurized Coolant Coming out of Overflow Tube" could also be a symptom of simple overheating...the system does get put under (high) pressure if it boils anywhere... I suggest you get that temp gauge operational (or at least a functional replacement in there) and confirm the temperature and what's happening.

    Cheers








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      Pressurized Coolant Coming out of Overflow Tube 120-130

      posted by  122_Canadian on  Wed Mar 26 13:54 CST 2008
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      last visit: Tue Oct 20 07:51 CST 2009
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      OK Ron, I was going to get a temp gauge set at some point...I guess that point is now.







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        Pressurized Coolant Coming out of Overflow Tube 120-130

        posted by  planetman on  Wed Mar 26 15:03 CST 2008
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        last visit: Fri Oct 24 09:29 CST 2014
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        Hello,

        Check your thermostat, they can stick closed, especially if the car is not run for a long time.
        --
        Eric
        Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
        Torrance, CA 90501








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          Pressurized Coolant Coming out of Overflow Tube 120-130

          posted by  122_Canadian on  Wed Mar 26 17:49 CST 2008
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          last visit: Tue Oct 20 07:51 CST 2009
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          I removed the thermostat, it looked clean...I heated it in water to a boil and it worked fine (opened at 180+ F). I think it may have been stuck closed as my e-fan didn't kick in. I reinstalled everything and took the car out for a drive, when the engine got up to temp, the fan kicked in, with no boiling over. Problem solved for now.

          Thanks,
          Craig








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          Pressurized Coolant Coming out of Overflow Tube 120-130

          posted by  122_Canadian on  Wed Mar 26 15:25 CST 2008
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          last visit: Tue Oct 20 07:51 CST 2009
          [RELATED]

          Thanks Eric...I'll go pull it and put in in some hot water. There was no other signes of the HG blowing (white smoke etc).







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