Volvo 670 Cummins Coolant issue

Discussion in 'Ask An Owner Operator' started by bobk786, Nov 7, 2020.

  1. bobk786

    bobk786 Bobtail Member

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    Sep 5, 2013
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    Hi all. Driving 2007 Volvo 670 with Cummins. 1.25m miles. Woke up yesterday morning to red triangle and low coolant warning. Top coolant hose had cracked while idling at night. Changed hose and dropped 3.5 gallons of coolant into reservoir. Drove 600 miles no issues. Today when starting truck got low coolant sign again. No leaks that I could find. Checked reservoir and saw coolant was on low side, added appox 3/4 gallon coolant to get to max cold line. After warming up engine coolant is almost to the cap. Overflow is empty, will it just level out or am I going to have to try to drain main tank? Any suggestions?
     
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  3. Eboogey

    Eboogey Bobtail Member

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    Nov 4, 2020
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    Check the pressure relief cap on reservoir, or you may have air in the system.
     
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  4. Rockslyde

    Rockslyde Bobtail Member

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    Feb 3, 2019
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    I think this fairly common. When you get as low as you did, you get some pockets of air in the system. This has happened to me whenever I drain my radiator. You should be good to go now.
     
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