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Coolant blowing out the overflow.

Discussion in 'International Forum' started by uncleal13, Mar 22, 2015.

  1. Mar 22, 2015 #1
    uncleal13

    uncleal13 Road Train Member

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    My brother-in-law is driving a 2001 int'l 9900 with a 475 hp ISX. He is loosing coolant out the overflow. Thought it might be a head gasket, drove it from Edmonton all the way back to Bracebridge, ON. Mechanics checked everything out, pressure test coolant system, oil analysis, etc. no head gasket leak, coolant system maintains pressure test,
    no coolant in oil.
    But cooling system is still pressuring up but mechanics are stumped. So he's on his way back out to Alberta again, topping up the coolant every once and in a while.
    Any thoughts on what else to check ?
    A friend had a 1996 FLD with a 3406E that did that this, it turned out to be the air operated temperature control valve on the sleeper heater core blew a seal so the air system was pressuring up the coolant line. Does a 9900 have this ?

    thanks
     
    uncleal13, Mar 22, 2015
    uncleal13, Mar 22, 2015
    #1
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  3. Mar 22, 2015 #2
    icsheeple

    icsheeple Trailing the Herd

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    How much coolant loss?
     
    icsheeple, Mar 22, 2015
    icsheeple, Mar 22, 2015
    #2
  4. Mar 22, 2015 #3
    uncleal13

    uncleal13 Road Train Member

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    One to two gallons a day.
     
    uncleal13, Mar 22, 2015
    uncleal13, Mar 22, 2015
    #3
  5. Mar 22, 2015 #4
    heavyhaulerss

    heavyhaulerss Road Train Member

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    mine did that 12 years ago. it was the head gasket, but for some reason the pressure test did not reveal that. 1-2 gal a day is a lot. I guess you could make sure your rad cap is good & at the working pressure relief.
     
    heavyhaulerss, Mar 22, 2015
    heavyhaulerss, Mar 22, 2015
    #4
    Ruthless and uncleal13 Thank this.
  7. Mar 23, 2015 #5
    Bout Z

    Bout Z Light Load Member

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    Any fuel in the coolant? Had a similar issue with my 9900i, injector cups were leaking and putting fuel into the coolant system, and pushing coolant/fuel out the cap. Every bit of 2 gal a day. Took a couple days to realize what was going on. If this is the case, be sure to flush the coolant system after replacing the cups.
     
    Bout Z, Mar 23, 2015
    Bout Z, Mar 23, 2015
    #5
  8. Mar 23, 2015 #6
    Heavyd

    Heavyd Road Train Member

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    Ok, simple things first, try a new rad cap and check the neck of the coolant reservoir where the cap actually threads on and seals if he has the plastic tank. Those tanks are only plastic and do crack or split sometimes and cause issues like this. The air compressor is another part that can cause pressure build up in the cooling system.
     
    Heavyd, Mar 23, 2015
    Heavyd, Mar 23, 2015
    #6
  9. Mar 23, 2015 #7
    uncleal13

    uncleal13 Road Train Member

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    Thanks guys, I'll pass this on to him tonight.
     
    uncleal13, Mar 23, 2015
    uncleal13, Mar 23, 2015
    #7
  10. Mar 23, 2015 #8
    rickybobby

    rickybobby Road Train Member

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    I had the same problem. Change the pre cooler and it fixed the problem.
     
    rickybobby, Mar 23, 2015
    rickybobby, Mar 23, 2015
    #8
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