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sprinkles08
sprinkles08, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 21597
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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I have a 2007 sl550 that has a roaring sound when the engine

Customer Question

I have a 2007 sl550 that has a roaring sound when the engine accelerates and last a few seconds when the engine slows. Could the roaring sound come from the air suspension system?
JA: How has the ride been lately? Have you noticed any fluid under the car?
Customer: No fluids, just drove the car nonstop from Houston ton can. No problem, smooth ride , 27 mpg even.
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Just received various opinions
JA: Anything else you think the mechanic should know?
Customer: That's all.
Submitted: 4 months ago.
Category: Mercedes
Expert:  sprinkles08 replied 4 months ago.

Hello and welcome to JustAnswer!

I suspect you may just be hearing the cooling fan if the noise continues for a bit after you stop. I doubt the noise is related to the suspension system, especially if it's described as a roaring sound. A roaring sound that's actually coming from the engine compartment is most likely air noise from high cooling fan speed.

How long have you had the vehicle?

Are you using the a/c when you hear this?

Customer: replied 4 months ago.
I just purchased and the problem exist with or without the air working. The noise gets louder upon acceleration. The car runs smoothly and rides great. The noise sound like a whining pump.
Expert:  sprinkles08 replied 4 months ago.

If you've just purchased it then you may be hearing a normal noise.

The noise is coming from the engine compartment for sure?

Customer: replied 4 months ago.
This noise is a little more than a fan. The problem has been diagnosed as a possible air suspension pump problem. Thanks for trying.
Expert:  sprinkles08 replied 4 months ago.

You're welcome and good luck with your repairs.

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