About 2 months ago my trusty,yet sometimes troubled, Disco blew her headgaskets. We've replaced them along with most of the cooling system. The radiator and thermostat were replaced a year before. The day I finished with HG I took it out and drove for an hour or so with no issues. I took it to work the next morning and she left me stranded on the side of the road. I took it out yesterday after getting tired of watching it sit and It ran fine. Heat blew warm and it didn't overheat but it still had the gurgling in the dash. I have tried all the surefire ways to get the air out but to no avail. I once again did a chemical test and it passed that. No coolant in oil and nothing from the muffler. I really want to get this thing running again instead of selling it.