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Hello all I'm replacing the radiator in my 67 Electra with A/C with a factory style replacement radiator. Would anyone know what the original radiator cap was for this application? Is it the RC15 or the RC 26? Would an RC115 have been a dealer option for that year as well? Thank you for any and all help with this. - Bill
The '68 manual doesn't go past '63 for rad caps.
My '79 manual shows '57-'69, all as running a 15# cap.
The AC RC-15 cap (then aka GM 3886273) was supplied originally for your car.
The AC RC-26 (6410206) was a 15 psi cap used on aluminum radiators or aluminum pressurized expansion tanks. It was popular on '60s Corvettes but never used by Buick as far as my parts books go.
The AC RC-115 (13502509) is a much later (2008?-up) 20 psi cap. It would be unsuitable for use on the '67 models.
The RC 115 I'm referring to is GM part # 861854 a dealer installed part. Its a # 15 - 15lb cap known as the Roto Safety. Not the plastic tank cap in use today with the same number. It has a red plastic rotary knob on top of the cap to release pressure in the event of overheating as opposed to twisting the standard cap to the first set of notches and having it belch antifreeze all over. There are a couple of them on Ebay now.Quote:
Originally Posted by TODD
Edit: I guess my question really is was the old style RC 115 available in 67?
Sorry, without the part no, I did not drill down far enough in Google to find the original Roto-Safe type. Here is one item that dates to 1962 going by the box:
https://www.ebay.com/i/312351829101?ul_noapp=true
Other items in eBay show the box with and without the GM Mark of Excellence symbol. That symbol started showing up on the cars and in the brochures for the '67 models. so that should prove the RC-115 was still in production in '67.
Thanks for the help Todd.