Coolant leaking out of cap at 20psi
Got a 2005 6.0 that's loosing coolant and I can't figure out why.
Back in Sept 2011 the oil cooler went out so my son and I tore the motor down, had the heads checked and magnafluxed (checkout out fine), replaced the oil cooler, did a package deal from Sinister with EGR delete, ARP head studs, black onyx gaskets, coolant filter, SCT Tuner etc. Already had a Edge CTS and currently the temperatures run around 200 degrees give or take 4 degrees. About three weeks ago, one of the glow plugs had gone bad and we replaced it and the wiring harness on the passengers side. When we got done we noticed that the coolant was low and have been chasing the coolant ever since. It comes out the cap apparently (which has also been replaced) and the pressure runs at about 18-20 psi. Any troubleshooting ideas? I've got no codes and the motor really isn't running that hot, just the coolant keeps disappearing!