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A/c suddenly humming

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Old 09-02-2022, 06:49 PM
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2003 CLK320
A/c suddenly humming
So suddenly when leaving for work this morning I heard a humming-moaning sound from behind the dash. Also on auto fan is barely blowing. Clutch engages the A/C compressor ok, and when I shut off the compressor by pushing the "economy" button the weird noise stops. Never did this before and just started today. Now what might this be?

Rob
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Old 09-13-2022, 02:47 PM
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2003 CLK320
Well turned out the R134 was low.....recharged it but who knows how long that will last
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