Re: R134 blue caps

["jtrealtywebspannet" <jtrealty@xxxx>]

When converting to R-134 you are supposed to install new service 
fittings so you can't use the 1/4 shrader fittings anymore. Generally 
you remove the shrader valves in the 1/4 existing fittings and attach 
a new adapter valve on top of it. If the dust caps have a dimple 
inside that presses on the shrader valve then you are using the wrong 
dust cap. The dust cap is not for sealing purposes, it is only to keep 
the valve clean. They are supposed to be snug (finger tight). Most are 
plastic and overtightening them will crack them. If you are still on 
R-12 and someone replaced missing dust caps it is possible they are 
wrong for this application. It is really easy when servicing A/C to 
mix up dust caps for the Freon, the service valves, and service 
gauges, etc. If this happens, to be safe, replace the caps or someone 
someday may notice they are loose and tighten them up causing this 
problem again. Leaving them loose they may fall off or at least let 
dirt into the valve.
David Teitelbaum
vin 10757

--- In dmcnews@xxxx, "content22207" <brobertson@xxxx> wrote:
> You learn something new every day...
> 
> Answering an eMail question for a fellow, put a gauge on my 
DeLorean's
> A/C. Quick connect adapter spit at me when I removed blue cap. And
> I've lost freon. Appears cap was pressing slightly on shrader valve
> all this time. Is possibile I mixed brands of adapters/blue caps. 
Have
> loosened on all my vehicles to be safe.
> 
> Just throwing into knowledge pool in case it'll help someone else...
> 
> Bill Robertson
> #5939