No line pressure? No-pressure radiator cao? No thermostat, too? With no
pressure in the system, you must not have any temperature, either. After
all, in physics pressure is directly proportional to temperature (and
vice-versa) where volume remains constant. The other possibility is that
you do not fill the coolant system to capacity. The expanding coolant will
take up the "unused" room. (Air can be compressed more than fluid can.)
I don't think you have all the facts yet,
Also, if you drop down to a 7-lb cap, you will also have to change the
thermostat to a lower rating. Again, it is that relationship between
temperature and pressure. If you lower your rad cap pressure, and keep
your standard 180/190 thermostat, the rad cap will open as soon as the
thermostat opens. Cars have 15-lb radiator caps to handle the higher
temperatures, which produces higher pressures. If you go back to the days
when cars had 7-lb (or less) rad caps, the cars used a 150 or 160
thermostat. (Which is one reason why heaters today are so much better - the
coolant they use is hotter now than before.)
Bill
Vancouver, BC
> BTW (new thread): a friend in LA has installed the new (drinkable!!)
> antifreeeze/coolant - replacement fluid, that also, happens to involve
> NO line-pressure!!! You can remove its no-pressure radiator cap, @ any
> time (can you say INDEFINITE hose-life??).
>
> The down-side is its $50.00 cost, & the necessary complete removal of
> the antifreeze.
> Also, the car reportedly runs : "slightly-warmer",
> than before, with the 14-lb.-pressure system.
>
>
> The stuff reportedly "never " requires replacement.
>
> Anybody, else, 'running' this stuff?
>
> ALSO: I inquired about installing a 7 lb-pressure rad-cap, "to prolong
> the life of the coolant-system's hoses", & learned that , for each
> "pound" of line-pressure decrease, the coolant's boil-over point is
> decreased by 3-degrees. So, "you" gotta axe-yersef ifn you
> 'feel-lucky', & want to give-up 21 degrees of 'safety-margin' , in
> exchange for longer-lived hoses.
>
> Anybody 'running' 7-lb. radiator cap(s) on their car(s)?
>
> Neil Vedder
> & Horace
>
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