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Old 05-12-2002, 01:12 PM
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AC hisses and blows cool air

Hi all,

It's about summer here, and I noticed my 1990 190E 2.6's AC does not blow cold air, just cool air from the vents. It also makes a slight hissing noise when the AC is activated. My car had been sitting for a few weeks before, and after redriving it that's when I noticed the AC not working the way it should. Do I need freon (sp.) or some kind of AC repair? Is having a non-operating AC a serious problem that may affect the function of the car? The car drives fine, but I just need to know if this problem will lead to more serious mechanical difficulties. Thanks in advance.
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Old 05-14-2002, 05:00 AM
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The hissing sound might be the vacuum escaping from somewhere giving you an inoperative vent. Have you had a look at the AC sight glass?
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Old 05-14-2002, 08:01 AM
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I have the same problem. What should I look for in the AC sight glass (I did find it). Another question, any suggested methods for tracking down a freon leak?
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Old 05-14-2002, 03:26 PM
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I would suggest going to a repair shop that can regas the system and get them to put a dye through to find the leak. Even if you find it you aren't going to be able to recharge it yourself.

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