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Just wondering whether anyone has used a scan gauge to accurately monitor coolant temps to see whether there is a high coolant temp coinciding with this problem? Has anyone have recorded coolant temps over time, warm up thru extended operation?:icon_scratch:
 

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Haven't watched the SG, but it has never overheated and the gauge in the dash is always at 1 tick left of center.
Is there more to this then on first thought??

With 69K mi on the clock, I would agree mine has never gave an indication of "overheating" and the dash always (except warm up) displays 1 tick to the left of center but... when I hooked up a scan gauge and monitored the coolant temps from warm up thru extended driving of about 1 hr of 65 -70 MPH then following up by cool down on local roads for 2 miles on the way to and from work. One can see that the coolant temperature is quite active or at least on my '15 Cruze TD.

Observation shows that warm up is typical and reaches a steady temp of 192 to 198 for a while then at some point it seems that the temp becomes active and will start rising to 212 and from that point the temp will regulate between 216 and 208 (appears 212F +- 4 F). The higher the temps the higher the system pressure and therefore weak seals will be more apt to leak. Since I do not appear to be loosing coolant and everything otherwise appears normal I beginning to wonder about a weak or defective thermostat? However the thermostat on the Cruze appears to be more of a control (with a heater?), do we know whether the ECM at some point is going into some active state of attempting a "smart" temp regulation other then just simple temp stabilization @ 195 F? This could be kind of like the so call "smart" battery voltage regulation GM adopted but in this case the engine temperature? Or maybe this is just a matter of difference between where the dash gauge senses and where the location for the coolant temp sensor is located, assuming different sensors?
 

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Not to sidetrack off the OP's point of a coolant leak, but in answer to the above questions on monitoring coolant temperature, I have done this since about 10,000 miles, and currently have 58k. I have monitored the coolant temp with both an Ultra Gauge and currently use an Edge CTS. On flat ground on the highway, I see temperatures any where between 195 and 215. My daily commute requires a climb from 6000 ' in elevation to over 11,000' and back down to 9000'. The temperature really heats up in the summer when pulling the hills. I'm always at least at 227 and have seen as high as 235. It appears the shutters open at 218-219. This will keep the temp from climping high if it's not a steap grade. The fan, according to my CTS, starts kicking on at 213. By 230, it's at 50% speed. I've never seen it go past 60%. The time I hit 235, I was trying to get it hot to see when the engine temp gauge would move off it's normal position, 1 tick under half. It never budged. I personally don't like it over 215, but there isn't much I can do about it and I'm used to it my now. I typcially don't have the AC on, but it doesn't really affect how hot it gets, but it does affect how fast it gets there. I've had it hit 225 when it's only 30 degrees outside. EGT's are close to 1000, if not slightly over during the pulls. I've heard people talk about the message on the DIC (AC OFF DUE TO HIGH ENGINE TEMP). I'm not sure how hot that is, but it must be quite toasty!
 

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Discussion Starter #25
I'll have to check it soon after a Gulf Coast-to-Canadian Border road trip I took last week, but I didn't see any lowering in the time before that.

Regarding coolant temps: the delete\tune made a dramatic difference on the engine temps. It takes much longer to warm up, and usually reads 1-2 ticks cooler at freeway speeds than it did before the modifications.
 

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Just saying hi and obviously New here had my cruze since January 15 and now 108k on it. Me too has had this issue and been Following this form for some time. Dealer and I can’t figure out the slow leak but is also getting worse over time. Have replaced thermostat and water pump also New cap . And the oil isn’t milky. Anyway just wanted to say hi in the diesel section.
 

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No milky oil, but I discovered that the overflow tank was half empty again. The o-ring was quite gummy and nasty from various coolant particles, but I'm suspecting that if it is leaking from the evaporation action again, it's because I installed that o-ring at 90* and 95% humidity, and now I'm living where it's 35* and 15% humidity.
 

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I just spent $2400 on a new egr cooler -the tech said that it had developed a crack and was leaking coolant into the engine. So my car was in fact burning coolant. After all of that was replaced it then threw a def quality error. In response to that, the tech cleaned to nox sensors. He thought that perhaps the coolant had fouled a sensor. I haven’t had a chance to drive it far since then so cannot report on the result of cleaning.
 

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Picked my car up from the dealer, they just topped off the coolant, I don't think they gave it any attention. I don't see any leaks, so I guess I'll continue to watch it.
 

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Picked my car up from the dealer, they just topped off the coolant, I don't think they gave it any attention. I don't see any leaks, so I guess I'll continue to watch it.
Bump. A little over a month later and I'm down to the second to last tick mark. Pretty alarming to lose the much coolant in a little over a month ! Haven't noticed any puddles under the car. Maybe add dye if I can source some locally.
 

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I had the same issue. It was the coolant pump. Sometimes when shutting the car off after a more "aggressive" drive , the pump will slightly leak due to the temp+pressure in cooling system. Then next drive there will be no leak because the pump is running and the coolant is flowing. I had my water pump and timing belt replaced under warranty at 95k, no more slow loss of coolant Currently at 101k.
Hopefully this helps
 

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I'm going to bump this thread up. I've replaced my water pump, thermostat and reservoir cap and can't find this **** leak! I can smell the coolant when I get out of the car after a drive or if I'm sitting in traffic. Has anyone had any luck locating these leaks?
 

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Replaced those coolant lines going to the oil cooler a few weeks ago and also the oil cooler itself.

STILL getting the smell of coolant!!!! This is so frustrating.
 

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Have you checked by the EGR valve? Maybe one of the gaskets is failing causing a leak.
 

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Replaced those coolant lines going to the oil cooler a few weeks ago and also the oil cooler itself.

STILL getting the smell of coolant!!!! This is so frustrating.
My 2015 had a similar very slow leak, just a hint of smell. Dealership never could find it, and it still has the UV dye added. After a while it appears to have stopped. Have not seen any further loss of coolant, nor smell.

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