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Old 05-04-2008, 10:32 PM
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Join Date: May 2008
Posts: 1
Unhappy 1999 500SL AC not working

I have a 1999 500sl and the AC stopped working, only hot air blows out. I checked fuses and they were ok. I checked the low pressure side and it was high. Any suggestions what else to check?

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Old 05-05-2008, 03:34 PM
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Join Date: Feb 2006
Location: Louisiana266 Maloy Rd winnfield71483
Posts: 804
If you have a high pressure reading the clutch will cut out and not pump. you most likely have a restriction and probably at the expansion valve, your year may have the needle valve orifice,they tend to plug with a thick black gunk,if so then the system needs to be flushed,check around see if you can find a service place that will flush it with nitrogen, dose a great clean out.
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Old 05-05-2008, 03:35 PM
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I suspect that my "high" he means only 70 psi or so. A quiescent system will have such a reading on the low side.
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Old 05-05-2008, 10:27 PM
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Join Date: Jun 2007
Posts: 19
have your system cleaned and if that dont work put a rebuilt compresser and it will solve all your problem. the clutch is not working properly on compresser.
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Old 05-06-2008, 12:52 AM
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Join Date: Feb 2002
Location: St. Louis, MO
Posts: 340
If the cold air went away ....

suddenly, you could have a bad evaporator temperature sensor. A lot of MB cars have diagnostics that can be run with the A/C controller. Look for info on how to do this and interpret them. Use the search feature of the forum.

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