[W126 Coupe] ?? climate control question...

[Dick Spellman]

Gary,

Sure sounds like the push button control is going south or the vacuum 
switching valve is failing.  You can test the vacuum switching valve 
after removing pass side carpet and lifting the acc pushbutton wood trim 
forward.  Need a mighty vac to test each vacuuum lead to the pods in the 
dash.  Honestly, if the pods are original, you should rebuild them.  The 
mighty vac will tell you which ones are already leaking easily.  Not so 
bad if you are operating an SEC with no air bags.  If air bags, yeah 
it's a bit of effort to get to certain of them.

If you are hearing any clicking from this area when the valves are 
moving the air all over the place, it is the pushbutton control.  
Rebuilt with 3yr warranty available for $150-175 depending on where you 
source it.  Requires you test with a meter both the mono-valve and aux 
heater pumps for shorts or grounds before putting new unit in place or 
warranty is void.

Regards,

Dick

Gary wrote:

> i've asked this before, although the problem seems to have progressed...

>  

> the a/c cuts down when i speed up...and you guys gave the reason why 

> that would happen...well what's happening now is most of the cold air 

> is blowing out the top vents...eventually it will forceably come out 

> the middle vents.   oddly enough the side vents seem to blow 

> normally.    i'm thinking its those vacuum balls behind the console.  

> i truly hope not...too much work. 

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