I've had same experience on my house AC.  No purge, takes a long time, 
especially using a micron vacuum gauge.  Same pump, same gauge, far faster when 
system was purged with dry gas.
-- 
Max Dillon
Charleston SC

On April 7, 2019 9:32:03 AM EDT, Dan Penoff via Mercedes 
<mercedes@okiebenz.com> wrote:
>Max,
>
>I’m curious as to why purging with CO2 makes pulling a vacuum faster?
>The vacuum pump doesn’t care.
>
>-D
>
>
>> On Apr 7, 2019, at 9:29 AM, Max Dillon via Mercedes
><mercedes@okiebenz.com> wrote:
>> 
>> Job is done.  Finished up the AC about ten last night.  Still need to
>put the right front headlight back.  Wiper motor on that side has
>failed pointing straight up, so I'm going to try to correct that while
>it is out of the car.
>> 
>> Once the headlight is back in place, I'll go for a test drive and
>check if the evaporator leaks were fixed by the cliplight sealer.
>> 
>> I purged the system with dry CO2 (tank from a welding supply place)
>and then pulled a vacuum with my $60 Chinese vacuum pump.  It pulled
>down to 29.5 inches in minutes.  Purging with a dry gas makes that step
>so fast.
>> -- 
>> Max Dillon
>> Charleston SC
>> 
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