Air Control Door

Apply 20 in. Hg vacuum to diaphragm. Diaphragm should not bleed down more than 10 in. Hg in 5 minutes. Door should not lift off bottom at less than 2 in. Hg. Door should be fully open at no more than 4 in. Hg. If vacuum diaphragm does not operate properly, replace vacuum diaphragm and repeat test.