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Rad cap question
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Old 25 Feb 2014, 09:08 PM   #1 (permalink)
Cool Scooby
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Join Date: Jan 2006
Location: Scotland
Posts: 327
Rad cap question

I'm having a slight problem with coolant going into the expansion plastic tank next to the rad but never going back even when cold.
When I remove the cap on the small tank next to the turbo when cold there is a bit of a vacuum.
So I took the expansion bottle off and topped up the small tank and it took the bottle level back to where it was before.

I also checked the rad and coolant is right to the top.

Looking at the cap the one on the small tank it is 108kpa pressure release and also vacuum releases back with the small pull down plate under the cap.

But on the radiator cap it is 137kpa but the silver plate underneath does not budge I.e. It does not seem to vacuum back from the overflow bottle. Is this normal? Is this cap different?

Looked all over Google but can't find a definitive answer..

Car is 2008 sti 330S
Some say he naturally faces magnetic north, and that all his legs are hydraulic...
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