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Thread: Correct Radiator Cap For 67 Electra?

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    Correct Radiator Cap For 67 Electra?

    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

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    The '68 manual doesn't go past '63 for rad caps.
    My '79 manual shows '57-'69, all as running a 15# cap.


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    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.
    What has been, can be again. (Bob Wills, 1942)

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    Quote Originally Posted by TODD View Post
    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.
    Edit: I guess my question really is was the old style RC 115 available in 67?

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