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  #1  
Old 12-31-2003, 09:29 PM
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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?

Thanks

Phil
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  #2  
Old 12-31-2003, 09:48 PM
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It might mean it is too cold for AC.
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Steve Brotherton
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  #3  
Old 01-02-2004, 01:43 AM
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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
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  #4  
Old 01-02-2004, 02:10 AM
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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.

Phil
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