Phantom Coolant Leak in 2004 Tahoe

[regguay]

coolant loss in Yukon

Was reading posts on this awhile back and had same problem on our 2005 Yukon at about 130,000 miles was loosing more and more coolant maybe few liters between oil change, was not leaking anywhere evident. tried hydro carbon test from rad reservoir and was not indicating hydrocarbon leaking into coolant, so put in some of the GM coolant leak tabs and within about a month or two, no more leaks, been about 6 months now and has not dropped. Not sure if heads or gaskets start to leak or if heads have porosity but will run with this as long as we can, had vehicle 7 years now and doesn't owe us anything, good luck to anyone else with this problem.

 

[jl449]

I know this is in the wrong forum section but we recently bought a 2015i Denali to replace my old faithful 2002 Tahoe z71. I have the same issue with the coolant on the 2002 with 145K miles. I have to add coolant to the reservoir every few months ... not much. I bought a gallon about 8 months ago and still have little less than 1/2.
I'm going to try the K seal as mention by Hosseface. Hopefully this will take care of the small leak. But is it safe to leave it in the coolant?