Thread: cold radiator?
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Old 04-07-1999, 10:49 PM
Benzmac
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The cap has two functions. It holds pressure in to raise the boiling point of the coolant but it also has a check valve built into it to allow for contraction when cooling. If this check valve fails you may hear a sucking sound when you remove the cap. That sound is actually vacuum not pressure. I would replace the cap before going any further.

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