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2008 AMG CLK63 Conv., 2012 R350 4-Matic, Wife's 2015 C300 sedan
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Discussion Starter #1
Got the vacuum pump. Got the hoses.
Which side(s) do I suck on?
Engine / AC running or not?
What's a realistic target vacuum pressure?

This applies both to my CLK3 and the old Discovery which is about to get a compressor transplant.
 

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E320/E250 Bluetec Ford F350 6.7l
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36,198 Posts
Best on both ports, but single 1 will do as well.
You don't want AC compressor to turn dry.
Take your time, the vacuuming main purpose is to suck moisture from the system and water evaporation is not instant.
Meaning run the pump for few minutes, stop, go for a cold one, start it up again till it reaches max what pumps gives you and than leave the gauges connected for like 1/2 hr to make sure you don't have leak.
Vacuum side of the gauge is lousy, so tapping it helps in actual needle movement.
 

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1999 E320, 2003 E320 Wagon, 2005 C230K SS, 2010 Accord LX w Eibach & Koni FSD's
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2,473 Posts
To remove moisture, run 30-45 minutes.
 
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