Re: 1955 400' radiator overflow
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Home away from home
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Could be you have the wrong cap. If it doesn't seat at the base of the neck, you will get water going out the overflow.It happened to my friend with his 54 Cavalier and that was the problem.He obtained the proper cap and the problem was solved.
Posted on: 2015/8/28 9:08
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Re: 1955 400' radiator overflow
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Forum Ambassador
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GTO has probably nailed the problem, a radiator cap with the wrong depth from cap to seat - a very commonly encountered problem.
Posted on: 2015/8/28 9:12
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Re: 1955 400' radiator overflow
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Just popping in
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What is proper radiator cap pressure for my 55?
Posted on: 2015/8/28 9:14
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Re: 1955 400' radiator overflow
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Forum Ambassador
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12 psi.
Posted on: 2015/8/28 9:32
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Re: 1955 400' radiator overflow
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Forum Ambassador
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For the possible incorrect cap length others have mentioned, I wonder. 54 and earlier needed a long reach cap and that is a frequent cause of the overflow if someone has installed a modern readily available standard cap. Perhaps others can elaborate more on the cap. I thought they changed to a standard length neck in 55 and if the radiator is stock, the need for the extra reach cap was not a issue with V8 cars. Am I in error?
Is your present cap in good condition and are you filling to approx 1" below the cap sealing surface. Leaking cap and overfilling are also causes of water overflow.
Posted on: 2015/8/28 9:41
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Howard
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Re: 1955 400' radiator overflow
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Just popping in
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Newer cap from auto part store (supposedly correct they looked up in their parts book). My fault for not taking old cap in to match.
Posted on: 2015/8/28 9:54
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Re: 1955 400' radiator overflow
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Just popping in
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Thank you for info.
Posted on: 2015/8/28 9:54
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Re: 1955 400' radiator overflow
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Just popping in
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Thank you for info.
Posted on: 2015/8/28 9:55
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Re: 1955 400' radiator overflow
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Forum Ambassador
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I had the incorrect cap on my 56 when I first bought it, kept blowing coolant from the overflow. If appearance matters you can buy a 13 psi AC-licensed and exact replica of the original factory cap ($33.50 at last look). I believe you want the RC-6.
oldcarstuff.com/radcap.html
Posted on: 2015/8/28 10:08
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