Smoke and Noise when AC is on - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 01-11-2014
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Smoke and Noise when AC is on

It started today. Probably the AC Compressor right? Would this have anything to do with my new battery?
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#2 Old 01-11-2014
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Smoke coming out from where? just a smell through the vents or?


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#3 Old 01-11-2014
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Inside the engine. Over the belts. I couldnt get a better look because its raining.
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#4 Old 01-11-2014
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https://www.slkworld.com/slk-r171-gen...ngine-bay.html

https://www.slkworld.com/amgs/24970-r...ery-issue.html


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#5 Old 01-11-2014
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Going to need more details...

You're getting smoke in the cockpit, or just under the hood? What does it smell like?
Has the car been serviced recently (coolant, windshield washer fluid).
With the NE weather of late, did you go through a really nasty puddle?

Unlikely it has anything to do with your battery.


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#6 Old 01-11-2014
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Smoke just under the hood when the ac is on accompanied with a disturbing sound. No recent maintenance except for the new battery. I cant tell what it specifically smelled like. No pot holes. Weather has been very warm the last 2 days.
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#7 Old 01-11-2014
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Sounds like something has gotten on the serpentine to the AC...is it a squealing noise? If so try to clean the belt off with some dilute water/soap (ie dish washing liquid).


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#8 Old 01-12-2014
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smoke

if the smell only occurs when a/c is turned on then the problem is that the a/c pump is very hard to turn or stuck.
when a/c is off the pulley still spins but doesn't engage the pump.
turning it on, i believe engages a magnetic clutch in the pulley and therefore turns (or tries to ) the pump.
the noise is the belt sliding on the pulley instead of freely turning with it. same as the smoke is due to the friction of belt sliding along pulley.

another possibility is the belt and/or the tensioner are faulty. allowing the belt to slide instead of gripping when extra load of a/c pump is engaged.
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Last edited by markja; 01-12-2014 at 08:59 AM. Reason: extra info
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#9 Old 01-12-2014
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Originally Posted by markja View Post
if the smell only occurs when a/c is turned on then the problem is that the a/c pump is very hard to turn or stuck.
when a/c is off the pulley still spins but doesn't engage the pump.
turning it on, i believe engages a magnetic clutch in the pulley and therefore turns (or tries to ) the pump.
the noise is the belt sliding on the pulley instead of freely turning with it. same as the smoke is due to the friction of belt sliding along pulley.

another possibility is the belt and/or the tensioner are faulty. allowing the belt to slide instead of gripping when extra load of a/c pump is engaged.
that sounds like the answer
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#10 Old 01-12-2014
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Thank You everybody.

I'm going to take it to my mechanic tomorrow. He doesn't work on weekends and these problems always happen to me either on friday or saturday.
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