Heat and the AC click pop click - Mercedes Benz SLK Forum

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#1 Old 08-25-2013
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Heat and the AC click pop click

So I'm out with Bella and the BF yesterday, it was about 90..we go through a drive through for coffee..and I am hearing, clicking, or popping from under the car. Yes the a/c was on. As the clicking happened, you could of course feel a shift in the idle of the car. And the bf said it had to do with temperature and metal, and of course because the ac was on, that it was normal.

Was he right?


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#2 Old 08-25-2013
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don't know but moving to the r170 general discussion


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#3 Old 08-25-2013
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When the AC compressor turns on and off you will hear a click and there will be a change in the engine for a moment as the compressor is engaged. This would be noticed at idle more than while driving. This is what I have experienced on any car I have had. I believe the compressor turns off and on to prevent freezing of the coils.

That's my opinion anyway.

Hopefully a more qualified person will post and help.
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#4 Old 08-25-2013
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That pretty much makes sense.. thank you


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#5 Old 08-25-2013
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Quote:
Originally Posted by slk320chick View Post
That pretty much makes sense.. thank you
What Briland2 has described is correct. You just never notice it until you park near the idling car and hear it turning the a/c on and off.
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