06 duramax lbz coolant problems
Hello, I have a 2006 Chevy Duramax 2500hd LBZ, 6 speed allison, cc/sb 4x4, motor is stock, still has the egr-system/egr-cooler on it. I bought the truck from my Uncle and he is ocd with doing maintenance on his truck's, tractors, etc.. so I know the truck has been well maintained, it still look's new inside & outside & if I didn't say anything you wouldn't know it has 250k miles. Before I bought the truck from him, he had everything changed, all fluids, fuel filter, new passenger side cv-axle from dealership, new passenger side outter tie-rod, etc..pretty much everything serviced. I've had the truck for around 10 months, I haven't had the first problem with the truck till now. Around 4 month's ago the low coolant light came on, the temperature has been 185 since I bought it, the hose that goes from the egr-cooler to the thermostat housing busted a small hole, I found it using a rad. pressure tester, I replaced the hose, that was a pain-n-as*, I topped off the coolant with dex-cool and bleed the system. I have had nothing but problems since then, the low coolant light came on again a week or two later, I let it cool, took cap off slowly and it had pressure where I had to slowly remove the cap so it wouldn't blow out. Well I topped it off again, tried to bleed it again, it seemed like I got all the air out, drove it again, same thing, so now I'm starting to wonder if something else is wrong, the heat won't get hot, the truck takes a while to get up to temp 180-195 & then goes back to 170-180 & then the heat get's hott but as soon as it does it says low coolant level. I bought an ac-delco tank cap, that didn't do anything, I bought ac-delco thermostats, changed them and it's still doing the same thing. I let the truck sit overnight and drained about a quart of oil to see if it had any coolant in it, it was good clean oil. I've only put 3k miles on the truck since I bought it. I've asked him what he thinks & he keeps saying there's air in the system somewhere. When it's sat overnight, I top the coolant off and drive the truck 5-10 miles it will finally get up to temp around 180-190 but the low coolant light comes on and when I get out to check the reservoir coolant has blown out of the overflow & it's all over the passenger side wheel, fender liner, some on the outside of the truck. I have been trying to figure this out for 2-3 month's now, not even driving the truck much but around the block, a mile or 2 just to keep the batteries charged.
Thanks in advance for any help/advice.
If I posted this in the wrong section, I apologize, I've been reading this forum for 6+ month's, just joined due to I can only look at it on my phone, for some reason my computer lock's up.