02 Suburban low coolant problem

[rboit]

I have a 2002 Suburban with 100K miles. I just pulled a pop-up camper through the mountains of Utah and Colorado. The trailer was well within the towing capabilities of the Suburban, but we did pull a few tough grades in 2nd gear, and did push out a little coolant, which I replaced. The temp never rose above its usual level. Now that I am unhooked from the trailer, I am pushing out some coolant even after driving 10 miles in town. I just got a low coolant message, but when I look at the coolant reservoir, it does not appear that low, and my temp level is still normal. Any ideas. Thanks

[2000CAYukon]

Has the overflow cap ever been replaced? Pressure is important in the cooling system. I replace mine every 3-4 years.

I know that when I flushed the cooling system, the sensor was sticking and reporting low coolant after refilling the system. I tapped the side of the overflow tank and the light went out and never came back on.

//2000CAYukon

[rboit]

Thanks. I found out the area around the sensor is leaking, which explains my apparent overflow and possible malfunction of the sensor itself.