Very slow coolant leak on 2014 Diesel
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Thread: Very slow coolant leak on 2014 Diesel

  1. #1
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    Very slow coolant leak on 2014 Diesel

    I've been tracking a coolant leak for the past few months... I feel like it was happening last year too, but I always chalked it up to the typical/occasional need to add a splash of coolant to most vehicles. It loses about 1 hash mark of coolant every 2 weeks, or at least it's doing that now that temps are in the low 90's where I'm stationed. Those are the average temps in the shade, but it's in the low 100's in the sun on a cool day.

    Any thoughts on what this is? I can't find any leakage from a visual check in the engine bay, and have never once seen a puddle. My first thought was water pump, but I'm also wondering if the cap is venting fluid from all the excess heat.
    2014 Cruze Diesel
    -JDM Astar LEDs all around
    -Fleece Performance Delete
    -Fleece Performance Tuned
    2001 Silverado Diesel
    -5" full exhaust
    -Spectre CAI

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    97 Sierra 1500
    03 Sierra 2500HD
    04 Silverado Duramax
    07 Silverado Duramax
    03 Sierra Denali

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  3. #2
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    Drop some dye in and check it a few days later.

    My guess is head gasket.
    Tomko

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    I'll have to check that out. I'm not seeing any milkish crap in the oil, though.
    2014 Cruze Diesel
    -JDM Astar LEDs all around
    -Fleece Performance Delete
    -Fleece Performance Tuned
    2001 Silverado Diesel
    -5" full exhaust
    -Spectre CAI

    *Sold*
    97 Sierra 1500
    03 Sierra 2500HD
    04 Silverado Duramax
    07 Silverado Duramax
    03 Sierra Denali

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  6. #4
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    My 2014 CTD lost a water pump at 64,000 miles which I'm told is pretty rare. Apparently very common issue with the gas models but not diesels.

    Unlike your issue, my coolant leak went from zero to fail without warning. Took a short 5 mile jaunt into town for breakfast and came out to discover a large puddle of orange coolant.

    Chevy replaced the water pump, timing belt and tensioner under warranty, no charge. Details posted under Gen 1 Diesel Water Pump Failure.

    Good luck, hoping yours is an easy problem to identify and fix.
    2014 White Cruze Diesel, 3rd Owner, Bought 3/17 With ‘09 TDI Buyback $$$
    2006 Dodge Ram 3500 Laramie Megacab 4x4 Cummins Dually, 245,000 Miles
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    Thank you. I had the head gaskets go on my 97 Sierra, and it did the same thing as yours: fine one minute, and then oceans of coolant everywhere the next.

    I bought some dye on Amazon and it will be here tomorrow. Hopefully it's either a small fix, or if it is the pump or head gaskets, it's something I can identify and then show the dealer so they can replace it under warranty. Would much rather do it myself though :/
    Rivergoer likes this.
    2014 Cruze Diesel
    -JDM Astar LEDs all around
    -Fleece Performance Delete
    -Fleece Performance Tuned
    2001 Silverado Diesel
    -5" full exhaust
    -Spectre CAI

    *Sold*
    97 Sierra 1500
    03 Sierra 2500HD
    04 Silverado Duramax
    07 Silverado Duramax
    03 Sierra Denali

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    Off-Road Champion boraz's Avatar
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    put a new o ring on the cap

    its been documented on here before
    BradHerr, MRO1791 and Rivergoer like this.
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    Quote Originally Posted by boraz View Post
    put a new o ring on the cap

    its been documented on here before

    Is that just a new o-ring, or a new cap and reservoir, too?
    2014 Cruze Diesel
    -JDM Astar LEDs all around
    -Fleece Performance Delete
    -Fleece Performance Tuned
    2001 Silverado Diesel
    -5" full exhaust
    -Spectre CAI

    *Sold*
    97 Sierra 1500
    03 Sierra 2500HD
    04 Silverado Duramax
    07 Silverado Duramax
    03 Sierra Denali

  10. #8
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    'O' ring if you can locate one.....otherwise just replace the cap. Cap replacement is always the first step if no leakage (trails) are evident.

    Rob
    MRO1791 likes this.

  11. #9
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    Quote Originally Posted by starspangled6.0 View Post
    I've been tracking a coolant leak for the past few months... I feel like it was happening last year too, but I always chalked it up to the typical/occasional need to add a splash of coolant to most vehicles. It loses about 1 hash mark of coolant every 2 weeks, or at least it's doing that now that temps are in the low 90's where I'm stationed. Those are the average temps in the shade, but it's in the low 100's in the sun on a cool day.

    Any thoughts on what this is? I can't find any leakage from a visual check in the engine bay, and have never once seen a puddle. My first thought was water pump, but I'm also wondering if the cap is venting fluid from all the excess heat.
    Could be a small leak that evaporates before it hits the ground, therefore no puddles. If possible try running your finger under the connections to see if there is small seepage. Can't say that I've seen any issues of head gasket problems with these engines yet, especially the un-modified or un- tuned ones anyways.

    Might not hurt to put a scan gauge on to monitor your coolant temperature to see if you are running unusually high which might cause the reservoir to burp a little out on the days when temperatures are high esp if there is a thermostat problem.

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    So I dumped in 1oz of ACDelco dye in the coolant 2 days ago, and checked it this morning with a UV flashlight. I couldn't see any dye reflections anywhere on the motor (oddly enough, not even in the coolant tank). The oil checks out good too. The coolant cap always has lots of moisture on the underside of it, even when it hasn't been driven for a while, so I'm guessing it's the o-ring that's bad. Will replace that next.
    MRO1791 likes this.
    2014 Cruze Diesel
    -JDM Astar LEDs all around
    -Fleece Performance Delete
    -Fleece Performance Tuned
    2001 Silverado Diesel
    -5" full exhaust
    -Spectre CAI

    *Sold*
    97 Sierra 1500
    03 Sierra 2500HD
    04 Silverado Duramax
    07 Silverado Duramax
    03 Sierra Denali

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