Just a thought on air bubbles and water not circulating, a closed thermostat will trap an air pocket below it and not open when the engine is warmed up, Drill a small hole (1/8 th) is fine thru the thermostat flange to let the air thru, coolant will then circulate and the thermostat will open right and allow you to bleed the air from the system. It's not a Delorean problem only, all cars will do this, have been doing this since the fifties and saved a lot of over heating problems. Just keep checking your coolant bottle, as the air bleeds out more coolant will have to added. Lloyd---#3502 [Non-text portions of this message have been removed]