Bubbles in coolant reservoir

Discussion in 'Volvo Forum' started by JPSIPPY, Jun 13, 2019.

  1. JPSIPPY

    JPSIPPY Bobtail Member

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    I got 2015 Volvo D13.and recently I noticed bubbles in coolant reservoir. Took it to Volvo dealers in San antonio TX.they just change filler cap and pressure cap and add coolant above max mark.
    I see no bubbles after that.
    I wonder if that was this easy to fix ,I was thinking about big jobs like injectors, egr cooler, head,or air compressor.
    After they change caps I drive like 1600 miles with light load. Didn't see any bubbles but I see little coolant over flow from filler cap.
    Now I'm confused if my problem fixed or not yet.also had air dryer purge every 10-12 mins now increase to 20 mins.
    Pls give me ur views and if anybody had same problem.
     
  2. Cam Roberts

    Cam Roberts Road Train Member

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    bubbles and coolant puking from overflow is usually head gasket. Your air dryer purging has nothing to do with your motor issues. Your motor drives the air compressor and thats it
     
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  3. JPSIPPY

    JPSIPPY Bobtail Member

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    Why bubbles disappear after caps changed.
     
  4. Cam Roberts

    Cam Roberts Road Train Member

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    i wish i knew. thats weird. Bubbles usually not a good sign. but im used to old iron. I dont know, maybe they designed the newer emission trucks to blow coolant bubbles. Just doesnt make sense. someone else that could shed some light on it with more knowledge will chime in soon. wish i could be more help
     
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  5. starmac

    starmac Road Train Member

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    Hold up, I know nothing about how a volvo is set up, but a lot of freightliners had head gaskets changed because the heater valve for the sleeper was air controlled and put bubbles in the coolant.
    It is possible that the air comp constantly running may have something to do with it, but like I said, I know nothing about a volvo.
     
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  6. KB3MMX

    KB3MMX Road Train Member

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    Because pressure changes cavitation of the water pump impeller.... And controls localized boiling of small hotspots in the motor, usually in the head.(EGR Coolers in Emissions trucks too)

    Low pressure or no pressure in the cooling system can do Very Bad things over time.
     
    Last edited: Jun 14, 2019
    Cam Roberts and Newto Trucking Thank this.
  7. p608

    p608 Road Train Member

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    Probably burped itself
     
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  8. Bean Jr.

    Bean Jr. Road Train Member

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    Quite incorrect, unless you put a compressor head gasket in the category of head gasket instead of compressor. The compressor is liquid cooled and they blow head gaskets. When that happens, it will put bubbles in the coolant and blow it out the overflow.
     
    Opendeckin, Rideandrepair and p608 Thank this.
  9. Rideandrepair

    Rideandrepair Road Train Member

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    WS also, my 92 had air over electric valves on both bunk and cab.Freightliners not since 99 for sure, maybe earlier. Those things almost cost Me $$$ Once, Luckily figured it out.
     
  10. Rideandrepair

    Rideandrepair Road Train Member

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    Overfilling it will cause problems, fill it cold to cold level. Run a while at idle to get air out, Then it should be good. Cap it, it’s a closed system, level will fluctuate normally as needed for expansion, Hot level goes up, Park it and as it cools level will drop.If still losing AF or blowing out overflow, there’s a problem.
     
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