Packard Forum Index » Post-War (1946-54)

Hello ,I had an overheat and when I looked my radiator fluid it was a gallon low ,
now I forgot to check but I also figure the caps's old and may not hold enough pressure ,aNYONE KNOW THE NAPA OR other part number for the right cap ???,Ive got a new core in the radiator ,a new water pump and have new hoses ,so its the cap or me being forgetfull!

Napa -- from the parts x-ref

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Any good auto parts store should be able to supply you with a good functional cap. Just measure the depth of the neck from the sealing surface to the top, and tell them what pressure you want; the OEM cap for 1951 was 7 psi, not sure of 1952 but a 12 psi cap should be fine.

Betting someone comes along with a modern brand and part # for you.

Did you replace the thermostat? I've come to grief over forgetting that little item.

I hear the '54s are different, but still seem to be some myster. See "Successful Packard Hunt" thread under postwar. Nice discussion.

My (short) experience with my '54 is that you lose the coolant out of the overflow, even while driving, with the wrong cap (at least I think it's the cap causing it). I got the car with a 12 psi generic one-size-fits-all cap. Who knew there was so much to a radiator cap replacement?