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Really loud humming noise coming from around air filter in engine compartment on 99 explorer when very hot outside or Air Cond is on?
Wiki User
∙ 16y ago
The Ford Explorer uses an idle speed control valve that allows air to flow thru the idle air passage inside the intake manifold. When this air passage gets clogged up with carbon or grime it restricts the passage & the result is a loud humming / moaning noise. The repair is to remove idle speed control valve & spray carburetor cleaner or intake cleaner thru air passages inside intake manifold & clean or replace idle speed control valve.
Wiki User
∙ 16y ago
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