66 A/C Schrader Valves

[Steve S.]

Anyone know the correct size of A/C schrader valves on a 66 and where I can purchase them? Thanks,

[Leif A.]

Re: 66 A/C Schrader Valves

Steve,
From an old post:

"The correct replacement Schrader valves are AC # 15-3321, or GM # 12307041, or NAPA # TEM 209578"

More information in the multiple threads at the bottom of this page.

[Larry M.]

Re: 66 A/C Schrader Valves

The regular Schrader valves are available almost everywhere, and are the same for basically most home and auto AC systems. But you do want the Air Conditioning Schrader valves and not the ones for tires. The numbers from Leif look correct. Four Seasons sells them as well as #59346. Google this number for info on where to buy. Also, Ebay will likely have the Delco/GM if you search by the part number.

However, there is also a "special" low tension Schrader valve used on the oil return line from the evaporator to the POA/STV valve at the POA/STV itself. It cannot normally be seen. This one is DELCO #15-513 or GM# 5914817. It is near impossible to find or source. A friend or mine and I tried to find a substitute, and despite what all the books and vendors say, we could not find one that actually had the correct opening pressure. Fortunately we located NOS and bought out all the guy had. I have a few still available if this is what you need. If truly needed, I will send you one. Let me know.

Larry

[Steve S.]

Re: 66 A/C Schrader Valves

Thank you Larry and Leif for the information and Larry for your generous offer. I haven't gotten that far in troubleshooting but will be in touch if that particular valve is leaking. Thanks again. Steve