[W126 Coupe] "Popcorn Sounds" behind the climate control panel

[mavris2 at comcast.net]

Henry, 

If its what Dick has descirbed then thats probably it.  However, if you are hearing a every now and then pop, tick noise from the climate unit, its probably a sign that you push button climate unit is on its way out.  At least that is what mine did. More like a clicking noise for quite a while. It would work and did not always make a noise.  Then it finaly gave out :(   

Jason 
 -------------- Original message ----------------------
From: Dick Spellman <spell.yy at verizon.net>
> Hi Henry:
> 
> If this is the first time in a while since the car has been driven and 
> you are calling for heat vs cool, the sound could be the auxiliary water 
> pump pushing coolant through the heater core and a bit of air could be 
> trapped in the system from a prolonged period of no use.
> 
> I've heard it and it does go away with a bit of continued use and time 
> while in the heat mode (ECON with inside temp request higher than cabin 
> temp)
> 
> Dick
> 
> Henry Viveiros wrote:
> 
> >My wife's 1986 560 SEC has sounds similar to popping corn behind the climate
> >control panel. Maybe it sounds like "water bubbles"?. Anyone have any ideas
> >about what it might be?
> >  
> >
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