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Author Topic: Yellow Coolant cap  (Read 668 times)

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SP_3.2

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Yellow Coolant cap
« on: 07 February 2011, 13:24:16 »
Odd one this...but have a spare cap around and it has two holes on the under side ... if i blow into one of the holes should the air come out of the other one or not.

Just looking at a quick way off testing it. Also what are the holes for :question

Thanks

Steve :y
Steve.
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PhilRich

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Re: Yellow Coolant cap
« Reply #1 on: 07 February 2011, 13:51:59 »
It's a pressure release cap mate, when the system becomes overpressurised it vents the excess! :y
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SP_3.2

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Re: Yellow Coolant cap
« Reply #2 on: 07 February 2011, 14:59:24 »
Thanks for that Philrich  :y
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Andy H

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Re: Yellow Coolant cap
« Reply #3 on: 07 February 2011, 20:07:58 »
I think one hole is for pressure relief - as the coolant warms and expands a spring loaded valve lets air (or coolant) out if the pressure gets above 1 bar/atmosphere.

The other one is a vacuum breaker, a lightly sprung one way valve lets air in when the system cools down.
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