Attaching photo of a NOS AC RC-15 radiator Cap.  Hope this helps.

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Comment by Gene McIlroy on February 12, 2016 at 10:11pm

No! definitely did not have Cadillac on the cap.  I'm saying that the Ebay  hit might not have Cadillac in the heading but to  look for the part number.  The cap was used on a lot of GM cars.

Comment by Clovis on February 12, 2016 at 9:38pm
Gene are you saying that the original ones said Cadillac on them? If so I was not aware of that.
$60 to 125, double that for Canadian funds. The exchange is terrible right now and killing us if we want to buy anything in the USA. Heck anything that's imported or exported is killing us Canadians, and that covers just about everything.
Comment by Gene McIlroy on February 12, 2016 at 6:24pm

I would star with Ebay search "AC RC-15 radiator cap" there will be several different RC-15 caps just look for the one like the picture.  It may not say Cadillac but the part number is the key for authenticity.  most I've seen have been between $60.00 to $125.00 in NOS.  Go to a wrecking yard especially an older one, f you can find one that will let you look through their cars it's possible to find one there.  The caps are stainless and will clean up really well with some 40000 steel wool.  Good luck 

Comment by Clovis on February 12, 2016 at 3:55pm
Note what the cap says "inspect fall and spring" I wonder how many owners actually checked their antifreeze regularly? Nice cap where do I get one?


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