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Old 12-31-2003, 08:29 PM
pberku's Avatar
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Join Date: Oct 2003
Location: Montreal, Canada
Posts: 737
Bubbles in AC Sight Glass

My car is a '95 E300 series and came with Freon-134.

The ambient temperature here (Montreal Canada) is now around 32F. I happen to look at the Air Conditioning sight glass while the AC compressor was running and noticed lots of bubbles.

Does that mean that I may be low on Freon, or are the bubbles due to the low ambient temperatures?


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Old 12-31-2003, 08:48 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
It might mean it is too cold for AC.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 01-02-2004, 12:43 AM
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Join Date: Jul 2002
Posts: 1,141
Phil's right...

Said another way. It's easiest to check a/c charge on the *hotest* day of the year! If you get a 30 C day, the system has more pressure differential.

Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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Old 01-02-2004, 01:10 AM
pberku's Avatar
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Join Date: Oct 2003
Location: Montreal, Canada
Posts: 737
I tried a little experiment in my garage by pointing a hair dryer at the evaporator.

After a few minutes I noticed that the Freon started to rise in the sight glass. This leads me to believe that once the hot weather returns those air bubbles will disappear.

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