![]() ![]() These other things can also affect the "nominal" idling temperature : Even if the hood was left open during the idling. Not to mention that it is currently quite cool in most locations. Sometimes they never even cycle the electric fan. Today's cars run so efficiently that they don’t generate as much heat as in the past. ![]() I would not have the expectation that any levels would change. ![]() There are 2 things to ponder here, - losing a drop, (I'm not sure if you are referring to an external leak or a change in reservoir level). Hi gkohl223, Your statement " And here's another funny thing, after topping off the expansion tank to the specified level and letting the car idle for an hour, it doesn't lose a drop". So coolant being sucked into the engine is probably what's happening and it's such a small amount that it doesn't affect how the engine runs, yet. Anyway, I posted on this forum to see if others experienced something similar and to see if this was a characteristic of the 2.4l Ecotec engine. I was kind of hoping the water pump in my G6 was doing the same thing so that's why I changed it, but not so lucky. The leak was such a fine mist that it evaporated immediately and left no signs. I just happened to have my glasses on, was leaning over the engine looking for a leak when I noticed water droplets on the lens of my glasses. I was losing coolant for about 3 or 4 months until I finally found it. Most times, the pressure tester would find the leaks but I had this one leak that gave me fits. I use to have a '98 Grand Prix that would mysteriously lose coolant. Yes, I use 50/50 Dexcool but thanks for the feedback. I found an old thread on this forum from 2016 but the thread didn't end with an 'I found it". I have found mysterious coolant leaks in the past with my other cars but this one has me stumped. I only went 5 miles and the coolant level dropped 2". When I got home, I let the engine cool down before I checked the coolant level. So thinking that I was done, I topped off the expansion tank yesterday to the proper level and went on some errands. I've driven 100 miles with no further loss of coolant. When the coolant level reached 1" above the bottom of the tank, it stopped dropping. I wasn't convinced that the dye had circulated throughout the system so I decided to run with it until the expansion tank was almost empty. I spent an hour going over the engine compartment, top and bottom with a UV flashlight with no signs of leaks. A couple of weeks ago, I put some florescent dye in the expansion tank and looked for leaks a couple of days later. At first, I attributed it to air pockets but now it seems that enough time has passed so all air should be purged. Now I seem to be losing coolant at a faster rate. New water pump, new seals, new hoses, and new expansion tank. So I decided to throw parts at it since they were all original. When I did the last oil change, I collected a sample of oil when I first removed the plug and let it sit in a clear bottle for a few days to see if the coolant would settle to the bottom. There was no signs of coolant in the oil. Though I could only see the piston in the center, all pistons were bone dry. The plugs looked good and there was no sign of coolant getting in to the cylinders. When seeing the drop in pressure, I would re-pressurize to 15 PSI. I would lose about 1 PSI per hour but that could be attributed to the tester. At first the coolant level dropped about 1/2" but then held steady. Pressurized the system for 4 hours at 15 PSI with no visible leaks. The coolant level would be just above the bottom of the tank and it was consistent and predictable. I recently did a cross country trip with this car and would have to top off the expansion tank every 2-300 miles. I'm am constantly having to top off the expansion tank and there are no signs of leaks. I have a 2009 Pontiac G6 with the 2.4 liter engine. ![]()
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