Chris,
I use a standard American STANT cap with lever release at 14 psi for
cars with water recovery systems. That's a two way valve inside, which
will not harm your system.
They only suck water from the reservoir (if you have one), or suck in
air to fill a water loss (which you should not have, if the system is
sealed.) The pouring of water out the filler neck only occurs in a
recovery system when the pressure exceeds the 14 psi, as it should in a
non-recovery system.
The problem is, you see, the recovery systems keep the entire block and
radiator filled with water from the reservoir on cool down. On warm up
the water is heated and expands, pushing open the cap and adding some
water to the reservoir.
Using this cap in a system without a reservoir, if you fill the
expansion tank (assuming you have one) all the way up, and refilling it
after the thermostat opens (keeping the cap off) only once during new
anti-freeze change annually, you will loose fluid.
You should NOT fill the expansion tank more than just over half full if
you have no recovery system, as it will push it's way out until it is at
that level anyway.
If it is like that, it is okay. If you are always pushing water out,
even with the tank half full, it sounds like you are overheating and
opening the cap by exceeding its pressure. If the pressure is not 13 to
14 psi, but lower, this can happen.
You should have no problem getting the recovery type lever 14 psi high
performance Stant unit at any auto supply, and it should work fine even
without a recovery system.
Steve
--
Steve Laifman < Find out what is most >
B9472289 < important in your life >
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