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Old 05-11-2003, 12:15 PM
Ken300D Ken300D is offline
Registered Diesel Burner
 
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
I'm pretty sure the humming is caused by air bubbles when the fluid level gets low. I have to top off my reservoir about once every two months, and it only takes maybe four ounces of fluid to do that.

Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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