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02-02-2019, 08:00 PM
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#1 |
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Registered User
Join Date: Dec 2016
Location: Snohomish washington
Posts: 44
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Radiator caps
I’m installing recovery tanks in a 69 & two 72 trucks . I was told that as long as I had one with a gasket at top of cap I was good. Not the case was told any part store had them again not true. The pollpet at bottom of cap aka round stainless must not be spring loaded. It must hang down. Upon warm up pollpet is pushed up on cool down it lowers allowing coolent to be drawn in to radiator.cap must be vented! Have part # if anyone needs
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07-01-2019, 02:04 PM
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#2 |
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Registered User
 
Join Date: Feb 2019
Location: Nor Cal
Posts: 822
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Re: Radiator caps
What is the part #?
I am replacing my original radiator cap with a recovery tank and need to know what cap to get. 1968 C20 BBC AC
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1968 C20 Fleetside 396 4sp PS PB AC CST . https://www.youtube.com/watch?v=RWK8GgWD4uA |
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07-01-2019, 04:16 PM
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#3 |
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Senior Member
Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,210
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Re: Radiator caps
Stant #10231 vented 16 PSI cap
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Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
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07-01-2019, 09:20 PM
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#4 |
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Registered User
Join Date: Dec 2013
Location: Dunwoody,Ga
Posts: 443
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Re: Radiator caps
I thought the coolant expanded when it got hot raising the pressure past the spring tension of the cap allowing coolant to escape to the recovery tank.
Then when it cooled down the pressure of the system dropped below atmospheric causing the coolant in the recovery tank to be forced back into the radiator. |
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