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Old 06-14-2004, 10:53 AM
csnow's Avatar
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Join Date: May 2002
Location: Mass
Posts: 1,127
A/C- Doh! Post Vacuum Dilemma...

Working on Jeep, not MB, but really good A/C expertise on this board...

This is an r-134a system.

1) I replaced my condensor, liquid line, and receiver/dryer.
2) Put a vacuum on the low, closed valves, waited an hour, no loss of vacuum. Good so far...
3) Hooked up high side as well, then ran vacuum overnight. Great so far...

4) Went out in the morning, closed manifold valves, vacuum falls to Zero in 3 minutes! Curses!. Turns out it was leaking around the high side coupler! Somehow not fully engaged on fitting.

5) Fixed the problem, ran the vacuum for 6 more hours, charged the system, and it runs fine.

The question is, did I use up the dissicant in the receiver/dryer or otherwise suck too much moisture into the system by pulling a vacuum with a small air leak all night? Even with the leak, the gauge was still reading -30.

Should I bite the bullet, and replace receiver/dryer again, or leave it be?
1986 300E 5-Speed 240k mi.
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