Yup I had no compresion inm the radiator on mine and it would only occationaly lock up at first.

 

[quote=Dave Sponaugle;7289558]Is it loosing coolant.

Deopending on where the hole in the cylinder is, the coolant may be on top of the piston or go straight into the oil pan.
The engine will only hydrolock when coolant is on top of the piston.
And if you just bump the starter or if the engine sits long enough the coolant will leak down to the oil pan and the engine will run normally.

If the cavitation hole is low in the cylinder you may not even see compression in the radiator.[/quote

i have noticed its loosing kinda a tiny bit, but the radiator cap on my dads truck dont have the rubber seal, so i figure thats were the coolant is going and there is no pressure also cause there is no seal on the radiator cap

 

Radiator caps are cheap.

 

my dad is cheap to lol