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Difference between vented and not vented radiator cap?

Started by TJ Hopland, October 16, 2009, 09:23:00 PM

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TJ Hopland

October 16, 2009, 09:23:00 PM
What is the difference between a vented and not vented radiator cap?
73 Eldo convert w/FiTech EFI, over 30 years of ownership and counting
Somewhat recently deceased daily drivers, 80 Eldo Diesel & 90 CDV
And other assorted stuff I keep buying for some reason

jeff1956

#1
October 16, 2009, 10:28:27 PM
vented caps have the safety pressure release lever...unvented are the standard issue cap you cant let the pressure off with except to slowly remove it...i go vented for personal safety.

jeff

RobW

#2
October 16, 2009, 10:33:40 PM
Vented were used on older models without an overflow recovery tank. Non vented was used on newer models with the recovery tank. With the tank you're venting at the recovery tank far enough away from the radiator to not loose coolant in the process.
Rob Wirsing

TJ Hopland

#3
October 17, 2009, 09:47:31 AM
Thats what i was thinking.   Vented= no tank   

If you have a vented cap with a tank what happens?   Does it not draw coolant back if it needs to?
73 Eldo convert w/FiTech EFI, over 30 years of ownership and counting
Somewhat recently deceased daily drivers, 80 Eldo Diesel & 90 CDV
And other assorted stuff I keep buying for some reason

Otto Skorzeny

#4
October 17, 2009, 10:53:58 AM
It works the same as the other. The ones with the lever on it are just so you can release pressure manually in an emergency without burning yourself.
fward

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TJ Hopland

#5
October 19, 2009, 09:38:13 AM
I understand about the ones with the lever.   What I am trying to figure out is you can buy a cap that looks looks identical in every way except one says vented on it.
73 Eldo convert w/FiTech EFI, over 30 years of ownership and counting
Somewhat recently deceased daily drivers, 80 Eldo Diesel & 90 CDV
And other assorted stuff I keep buying for some reason

bill henry

#6
October 19, 2009, 05:42:15 PM
the vented cap does only has 1 rubber seal instead of 2 so it could let you suck back air instead of coolant . this is what i have on my 69 Camaro with no coolant tank
Bill Henry
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