How to determine popped head gaskets?

[white05]

I chipped my truck about 5k ago and have lost about an 1 1/2" of coolant since then and haven't seen any leaks. I pressure tested the cooling system when it was cold and hot and the gauge held steady, I'm trying to figure out where my coolant went. Any ideas on what else to try? I need to figure out soon since I have to pull a 20k camper 1600 miles in about a month and I don't want to have to put it back to stock.

[dieselkane]

Is this on a 6.4?

[white05]

Yes, 6.4 with 14,000 miles and only 5,000 tuned with delete pipe. I have been running 210 tow setting on my spartan the entire time.

[dazed01]

You could try block testing it. Its a clear tube you put indicator liquid in and you put it over the filler hole for the coolant to see if it changes color. Color change indicates hydrocarbons in coolant that means you may have a bad head gasket.

[white05]

I'm going to order a tester this weekend and see what I come up with.

[dieselkane]

I doubt you have blown Head Gaskets already, but anything is possible.

[08stroker250]

Typically you will know where the coolant is if you blow a head gasket.....all over the drivers side of the motor and drivers side fender well. You could have an EGR cooler problem.