Climate Control - Cracking noise in dash - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 06-14-2013, 09:13 AM Thread Starter
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Cool Climate Control - Cracking noise in dash

I am hearing intermittent but chronic noises that sounds like what you would get by squeezing a CD jewel case. Took the Service Manager at the local dealership out and he says it is expansion joints in the venting. I accept that this is what it is, but the question is whether it is normal and how long should I expect it to go on for?

I am familiar with these systems to a degree and always thought such connections were corrugated rubber clamped to the harder parts. If this is a form of male / female overlap and slide it makes more sense as to why the noise, but one would think that this would be sturdier stuff or lubricated.
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post #2 of 5 (permalink) Old 06-15-2013, 06:29 AM
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No sounds coming out from my car, at least so far... Maybe that joint is dried up and requires changing.

Again, not sure how loud the sound is to fairly say it requires fixing.
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post #3 of 5 (permalink) Old 06-16-2013, 07:20 AM
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Have my car for 6 months,no such noise
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post #4 of 5 (permalink) Old 06-16-2013, 07:21 AM
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Sorry,my SLK is 6 months old.ML is a 2011.
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post #5 of 5 (permalink) Old 11-01-2013, 10:55 PM Thread Starter
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Well 6 months in and starting to get cold here. Used AC very little but still getting cracking noises and now getting another noise from the climate system. Sometimes when engine > 2k rpm it sounds like the fan is worn (you know when the bearing is gone and is makes a low-pitched oscillating sound at low speeds?). Definitely tied to RPM and makes sound regardless of system blowing or off.

Time to visit the dealer again.
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