Bill Miller wrote :
> The leak may only appear at full warm. (leak opens up when the metal
> expands) Here's what to do. Take the cap off. Warm up the car (you will
> overflow some coolant, so don't do it in the garage). Now, with
> the cap off
> and the car sorta warmed up, reach over to the carb linkage and rev the
> motor (gently at first!) While you are doing this, look in the radiator.
> Do you see any bubbles?? (It may spray, so don't look *too* closely, be
> prepared!) If so, it is likely a blown head gasket or a cracked head.
> Bubbles are a bad sign.
Note that this procedure can give you a "false positive". If the pressure
drop through the radiator is more than the drop through the engine (as it
usually is), the pressure at the pump inlet can go below atmospheric, which
may cause the pump to suck air past the seal.
Randall
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