Quote:
Originally Posted by Scott98
+1. The cheap Harbor Freight pump is a piece of crap and will never sufficiently boil off your moisture. I bought a 1.5 cfm vacuum pump for about $135 which is all you need for a car. You just need to run it a little longer than a higher cfm pump. Scott
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Ditto.
How many times have we posted this information ? There are huge threads which spell out what will and won't work properly in the long run. AC service is expensive and not much fun. A well serviced system ought to go 6-8 years before any refrigerant has to be added... this does not mean it has an unintentional leak... the front compressor shaft is made to have some leak in order to oil the front bearing. So some recharge is expected over time.. but a LONG time ... and this is why the system should be started up every month including in the winter.
Then someone will post that they used one of those venturi types and it worked fine..
What they won't tell you is that moisture left in the system by less than great vacuum procedure ( and failure to flush ) takes some time to do its damage.... perhaps a year or more... the mixing of the water with the oil and refrigerant makes acid which eats away at some of the interior metal parts... they then flake off and accumulate in the worst most important tiny places...