MOst AC systems today have blowout plugs.  These are usually
holes drilled in the recieved/drier and filled with just the right
amount of lead, that if the pressure gets to high it blowes.
All 1986 and newer VW Vanagons Ac systems had this.
Most of them I've seen leak.
                                    Eric

Stan Wilder wrote:

>I've never heard of a safety plug on an air conditioner dryer.
>I have seen a sight glass under a rubber plug on some dryers.
>I'd say that if you feel that your drier is the exception to the rule and
>did have a safety pop off then you need to replace the dryer because the
>fact that the plug is missing would indicate a stopped up dryer, that the
>dryer safety performed as designed or that the dryer is simply ready for
>replacement.
>
>Stan Wilder
>
>----- Original Message -----
>From: "Woten, Rodney" <rodney.woten@LENNOXIND.COM>
>To: <vanagon@GERRY.VANAGON.COM>
>Sent: Monday, May 10, 2004 8:47 AM
>Subject: Looking for "Safety Plug" for A/C system
>
>
>All,
>
>Finally got around to finding the leak in our '87 Westy.  It appears that
>the safety plug that sits atop the receiver/dryer, in the driver's side rear
>wheelwell, has blown it's plug.  It's basically a threaded plug with a hex
>bolt head on the top.  The center has a hole where, I'm surmising, a small
>hard rubber plug once resided.  It almost looks like an LP orifice with an
>oversized hole.  Bentley refers to this little dandy on page 87.7.Does
>anyone sell  these valves/plugs.  Ron @ Busdepot, Ken @ Vanagain?  Or will
>any A/C shop have something that will work?  I'd like to get this replaced
>so I can diagnose the rest of our A/C system.
>
>
>TIA!!!
>Rod Woten
>'87 Westy
>Des Moines, Iowa
>
>
>
>