That's what I was afraid of.  I may put a light on the connection, see if the 
PBU is calling for heat when I've dialed in AC, make sure the issue really is 
the valve.

Looks like a rebuilt PBU is about $150, that's less than a new valve from the 
Max Dillon
Charleston SC
'87 300TD
'95 E300

On July 25, 2015 5:41:39 PM EDT, Peter Frederick via Mercedes 
<> wrote:
>As far as I know, there is no insert in the W124 monovalve, I've had  
>to replace the entire thing when they fail.  Three so far...


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