I think my 2002 Avalanche Z66 is burning a little coolant. The last couple days my low coolant light came on. I noticed a puddle of coolant under the truck. It is coming out of the overflow after I turn off the engine. In the morning the coolant is a little low in the overflow container.

The engine temp while running is close to 200 degrees. the oil is clear.

Does anyone know what might be causing this?

 

make sure the pressure cap is on all the way, or replace it. It could be worn out.

 

What are you referring to as pressure cap?

 

the cap that holds pressure inside the cooling system .Yours is probably on the radiator.