Yes - that is exactly why I was confused Mark.  David - that makes sense if
the seal was busted - at one point I suspected there were holes in that
small hose that connects them (and there were, it was shot - but the backup
prevailed - despite my 'squeeze pressure test')

On Mon, Sep 9, 2013 at 12:52 PM, mark drillock <mdrillock@cox.net> wrote:

> We aren't talking about the cap leaking around the threads where air can
> come back in. The normal leaking mode is that the pressure regulation
> system of the cap fails and then coolant is easily pushed into the
> overflow through the hose barb of the cap. Air can't come back the other
> way unless the overflow tank is empty, since the cap hose discharges
> into the bottom of the overflow tank, below liquid level.
>
> Mark
>
>
> Dave Mcneely wrote:
>
>> Tom, if the pressure cap is leaking, then air can enter it just as
>> coolant can escape.   mcneely
>>
>> ---- Tom Carchrae <tom@CARCHRAE.NET> wrote:
>>
>>> This is not a different issue - this is my cooling issue....  :)
>>>
>>> I have a question to ask the experts regarding the bad cap theory.  I get
>>> how the fluid ends up in the overflow tank - but if it just a cap, where
>>> does the air/gas come from the displaces the coolant - and why does it
>>> not
>>> pull the coolant back into the pressure tank when it cools?
>>>
>>>
>>