Curly, I stand corrected. Your verbal diagram is the more likely
arrangement.

On Tue, Aug 11, 2015 at 7:40 PM, Curly McLain via Mercedes <
mercedes@okiebenz.com> wrote:

> The rear unit is plumbed in series with the front unit as far as the
>>> coolant flow, most likely.
>>>
>>
>> Unlikely.  Remember how AC works: it is not pumping cold fluid around,
>> it is pumping HOT fluid around.  The phase change that occurs at/after
>> the expansion valve sucks the heat out of the environment.  After the
>> phase change the coolant is cold, but has little remaining heat-carrying
>> capacity.  My read on it is that there are TWO expansion valves, all is
>> is wired in parallel.  The compressor/condenser is sized up accordingly.
>>
>> But look it up for sure.
>>
>> -- Jim
>>
>
>
> I think this is correct.  either can run independently of the other, or
> both can run at the same time, or both can be off.
>
> Plug off the in and out of the bad evap and charge what is left.  The
> trick is how much is a full charge.  Sight glass is the key for this deal.
> Scale won't help, other than to determine how much actually went in.
>
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