No idea about the restrictor but it doesn't seem too important given the
valve's existence.

The preventative maintenance approach suggests replacing the white bleeder
screw and O ring at 5/15/25 years since it breaks at about 6 years (and
carry a spare screw and O ring), and replacing the heater core and valve
gaskets (which includes the bleeder screw) at 10/20/30 years since it
leaks at about 12 years.

Cheers, Tom Neal

On Fri, 14 Jul 2000, Richard Bias wrote:

> All, (especially those of us who have or are dealing with the "rear heater
> caper")
>
>   I have been thinking about this for a while now and would like some
> feedback on my theory...  Could our rear heater trouble be caused by the
> "missing restrictor"?  I seem to recall that Bentley told me to expect a
> restrictor in one of the lines to the rear heater.  I did not find one in my