Help me with my disappearing coolant. I have to add about a half a quart and bleed it every time I drive it. My engine is a brand new build with Darton sleeves, OEM head gasket, ARP head studs and a milled head all with less than 150 miles on it. I also deleted my heater core. I pressurize my radiator to 20psi and there is no visual leak anywhere. I also pressurized my cylinders individually to 60psi and looked for any bubbles in my radiator or bleed valve. Nothing!!! I also ran the car to operating temp and then immediately took out the spark plugs and put a mirror over each cylinder to check for steam. Nothing!!! I am at a loss here. I would assume it is a head gasket but there is no sign of it being that. Any and all suggestions are welcome.

 

Did you check the coolant overflow tank, all hoses, and the radiator cap?

 

Cap and overflow are good.

 

Still has air bubbles in the system you are displacing. Give it another 100-200 miles and should be good.

 

^^^really????

 

Yeah, did the same thing for me when I did a coolant flush just a few weeks ago

 

I get the part about burping the air out but I didn't think it would be a continuous thing for a week.

 

Yup when I installed Turbo kit had to burp and fill overflow for a week, I thought something worse was going on to but just kept topping off and keeping an eye on temps and everything leveled out and stayed within operating temps.

 

Well that's good news. I'll give it a week and give you all an update

 

After you drive the car and it sits for awhile is there any coolant under the car?