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Coolant Expansion tank cap - should there be a seal?

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Old 16 November 2011, 05:22 PM   #1
joblogs0
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Default Coolant Expansion tank cap - should there be a seal?

Hey Guys,
Just wondering if this cap should have a seal?
Mine doesn't and I think I have air in the coolant system even after bleeding/burping. I've been told the air does come back even after bleeding, so wondering if the lack of a seal keeps leaving it back in!

This is the cap I refer to (except this guy painted his red!)
Click the image to open in full size.
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Old 16 November 2011, 05:40 PM   #2
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No is the simple answer. Just clips on and isnt presurized
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Old 16 November 2011, 05:48 PM   #3
DantheMan2605
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No it doesnt need a seal.

If you look on the side of the tank (between the cap and bumper) Theres a little hole at the top. This allows the expansion of the coolant when hot and cold.
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Old 16 November 2011, 07:04 PM   #4
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Cool, thanks for the quick answer guys, that answers that
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Old 16 November 2011, 07:07 PM   #5
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thats just the overflow/expansion bottle. As long as the pipe is submersed then its cool.
Your header tank it the important one. metal tank with a rad cap on it,left hand side of the bay.
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