I just flushed my coolant and had not problems in the past with it dropping below the minimum and now it will not stay above the minimum. I put 4 gallons of caterpillar coolant in it and it was fine at first then it started dropping. Does it need more than four gallons after I flushed it. I'm pretty sure its not my head gaskets just had them done last Feb. along with arp head studs, egr, and oil cooler.

 

leaking petcock?

 

How fast is it dropping??

 

It is supposed to be below the "min" line in the plastic. min is the new max. Aprox. 3/4 inch below "min" line is the new min line. Some of the degass bottles have a updated sticker on them. pt

 

about a week is how long it takes to drop

 

Check the petcock, or it may even be a leaking water pump or a hose.

 

I am not to sure on where the petcock is located can someone lead me in the right directioon.

 

Not sure exactly where the petcock is at. But they are usually on the bottom of the radiator on the opposite side of the lower coolant hose.

 

Is your truck lifted or leveled?

 

Who did the headgaskets and how were they done? They could easily be bad again. I highly doubt the petcock started leaking out of no where.