Questions about A/C vacuuming

Tim Dahm timd at
Mon Jun 7 14:07:01 EDT 2004

You may see 25" vac with the venturi vacuum if you're lucky.
Your results will be better if you get the engine compartment as warm as 
prior to vacuuming- ie sunny hot day, run the engine with hood closed, etc,.
This will increase your chances of getting moisture out of the system 
during the vacuum

91 cq
93 S4

cobram at wrote:

>The chances of pulling -30inches with a Venturi type vacuum and slim.  As
>another Qlister said, pull vacuum for around 30 minutes, if you have a
>good volume commercial compressor, you should be down around -20inches. 
>Close everything off and watch the dials.  If after another half hour or
>so you're still have the same residual vacuum, then you can fill the
>system.  If you lose vacuum, then you have a leak somewhere that has to
>be addressed first.
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