The Stovebolt Site Forums The Shop Area Engine Shop LOSING COOLANT

As the Engine and Radiator warm up, they both expand also and increase the volume of Coolant they hold.

So as the Coolant expands, so do it's Hosts.


Otherwise, I too would lean toward a 'hairline' Crack in the Head or a very small seepage via a bad spot in the Head Gasket, allowing Coolant into one of the Cylinders.

Although, I would kind of think that would also mean, that at least some Exhaust would be going into the Cooling System, also, if that were so.

Have you had it running with the Radiator Cap "off", and got your Nose right down in to the opening there to see if any exhaust smells were coming out of the Radiator Cap Socket?


As 52Carl relays a few posts above - Have a look at your Spark Plugs and see if any of them look a little off deposits/color wise.

Since yours is a 'Free Breathing' ( non pressurized and is vented to the Atmosphere ) Cooling System, there will be some evaporation of course.

And, changing to a low figure Pressurized Radiator Cap will change nothing ( and or the Cap would not even fit anyway ).