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If in doubt, replace it.
Answerwith the engine running take the valve out of the cover and put your thumb over the bottom of it, if you feel suction its working. you can also remove it and shake it, listen for the rattle. if no suction you may have sludege buid up in the line carrying the valve, or put a coat hanger thru it
it should rattle when shaken, then you should be able to blow air through one end real easy, but the other way should be completely sealed, no air whats so ever, if it does leak its bad, replace it. harry
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∙ 14y ago
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