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Hissing sound on coolant reservoir

  #1  
Old 08-24-2018, 09:04 AM
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Default Hissing sound on coolant reservoir

When I stop , i noted hissing sound from the coolant Reservoir. It took 3 minutes to stop the hissing. What is the problem?
 
  #2  
Old 08-28-2018, 02:45 PM
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Radiators must always vent excessive pressure, otherwise they will explode. It could simply be that. But it could also simply be leaking. If after three minutes you take off the cap to the reservoir and there is no pressure left inside, then you have a leak. Maybe a bad O-ring in the cap or even a crack in the tank somewhere. That needs to be fixed or your car may overheat. Pressure keeps the water from boiling. No pressure, and the water will boil, filling your engine with air (water vapor) and your car will not cool properly.
 
  #3  
Old 08-28-2018, 08:29 PM
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I went to a mechanic THIS PM and he conducted a pressure test. He did not find any leaks since the pressure did not dropped. I went to Volvo dealer and they told me that they made a diagnostic and they found nothing wrong. I am really confused what is happening to my Volvo Xc 90. I'm afraid that it will create more problem.
 
  #4  
Old 08-29-2018, 04:29 PM
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Sometimes snakes get into the cooling system. The large flow of hot water makes them angry and they hiss. This is probably what is going on.
 
  #5  
Old 08-29-2018, 09:01 PM
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you are weird
 
  #6  
Old 08-30-2018, 02:54 PM
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Or maybe it's the SERPENTINE BELTS!!! He he he!
 
  #7  
Old 08-30-2018, 05:18 PM
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Yes, they tend to hiss too. The serpentine belt is made of snake skin and it can hiss when the spirit moves it.
 
  #8  
Old 09-02-2018, 01:50 PM
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These cars use a closed coolant system - the coolant overflow tank pressurizes along with the radiator/hoses and gives the coolant a place to go when it expands. The port into the overflow tank is not very large - on the order of 1/16 of an inch so if the pressure test is ok, you are probably hearing the coolant just squeezing through that port as the coolant cools down and gets sucked back into the engine.
 
  #9  
Old 09-03-2018, 09:27 AM
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mt6127, Thanks for your comments. And to Tony19`63 and eflexter, I hope you will meet your serpentine in hell.
 
  #10  
Old 09-10-2018, 12:28 PM
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I'm going to have nightmares now about serpentine belts. Seriously, there is also the air conditioner system right next to the collection tank, which makes hiss noises of its own. It's really hard to tell what is making a specific unless you buy a mechanics stethoscope (yes that's a real thing). You did the right thing to have the mechanic check it for you. Sounds like there is nothing to worry about.
 
  #11  
Old 09-11-2018, 02:50 PM
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I still think that its snakes in the cooling system.
 
  #12  
Old 09-11-2018, 08:24 PM
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Altura, is this a one off incident or does it happen with frequency? Have you tried to pinpoint the source yourself, open the hood, see where it's coming from?
Even though the "experts" cleared the chance of a leak, it doesn't mean a thing! Lots of idiots in the automotive field these days don't know squat.
 
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