Any idea what a DEEP humming sound coming from car engine could be. I have a

rjmelendez

New member
2000 Ford PI Crown Vic.? This sound only happens when I start the car on a cold morning. It did the same last year during the winter months. But never does it when it is warm outside. The sound goes away within a few minutes of car being on. Any idea what this could be. I doubt it is the belt, I know what belts sound like (They sound more high pitch).. This sound is a VERY DEEP, almost muffled sound...
I forgot to mention that it sounds like it is coming somewhere from the air intake.
 
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