06 LBZ Coolant Leak?
OK I’m baffled...
06 LBZ, Stock,185K miles. Got a low coolant notice on the dash, level was just below the seam on overflow tank. Let it cool for 2 - 3 hours, topped off to fill line. Drove it about 100 miles next day, no problems. Checked when I got home, coolant level was 1/2” above seam on tank. Checked it next morning, level was same, opened top of tank an a small bit of pressure bled off and level went to where I had filled it to. Drove to work the next morning then home again (about a 15 mile round trip), when I checked it again the level was at the seam. This morning I checked it, level was back to where I had filled it, when I got to work it was down to 1/2” over the seam. Drove it about 4 miles then checked, level was back up to where I had filled it.
Truck has not overheated (200 max), coolant level never below middle of over flow tank, upper radiator hose not hard when running at temp, no coolant in oil I can see, no smell.
I’m baffled, any ideas?