PeachParts Mercedes-Benz Forum - how to test a/c system?

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Quote:

Originally Posted by ambush276 (Post 3509505)

i have some cans of R4 that i can use to recharge. I used the vacuum pump as instructed to test for any leaks in the system. There were no leaks. Sooo... How do you know there is no leak? Only way to test for leaks with a vacuum is if you use a digital micron gauge...

I then tested the R4 pressure and noticed that it is very very low (most of it is gone). but how is this possible? You tested for leaks...:rolleyes:

It held a vacuum fine for 1 hr. define fine...

did i misinterpret your instructions? whose instructions?

my buddy is an AC expert and will check the oil for me (but i didn't want to waste his time before checking if it held vacuum).

...

yea i am having my AC friend do the work on it. Thanks everyone for the help.

The chance that he will do it as right as you could have done with following our advice is slim.... people in the industry have shortcuts they think work just fine...
You could have had it really right for much longer than the usual AC guy.. no matter how nice he is... will do it...
Unless he studies what have been preaching....
I told you up front doing it correctly is very tedious .... but you claimed you wanted to do it right....